Blackheads differ from whiteheads because whiteheads are covered by skin, whereas blackheads are open to the air. What causes the dark coloration

Answers

Answer 1

Answer:

Lipids within the sebum react with air, resulting in chemical oxidation and the formation of the black color.

Explanation:

This is the answer. I hope it helps you out.


Related Questions

What is a technique that aims to reduce viable spoilage microorganisms so they are unlikely to cause disease?

Answers

Answer:

Pasteurization

Explanation:

Food products such as milk, wine and beverages may be subjected or placed on a heat treatment process with the aim of reducing active microorganisms present in them. This will improve the quality of food materials and also prolong its life span. This heat treatment process help destroy pathogenic microorganisms and those which are responsible for food spoilage. Once this food spoilage microorganisms are destroyed, the good products will have enhanced or prolonged life span of the food product and also reduces their risk of causing disease.

which type of hormone diffuses across the plasma membrane and binds to receptors in the cytoplasm module 16.4c

Answers

Answer:

Steroid hormones.

Explanation:

Steroid hormones is a type of hormones that diffuses across the plasma membrane and binds to the receptors present in the cytoplasm. The hormones are released from the carrier protein and diffuse inside the cell across the lipid bilayer of the plasma membrane of the cells. The steroid hormones pass through the plasma membrane of a target cell and attached to the intracellular receptors located in the cytoplasm or in the nucleus.

which type of data is qualitative data
a)height in meters
b) volumes in milliliters
c) calculations of density
d) descriptions of behavior

Answers

I’m pretty sure it’s D.
Qualitative data is data that can be observed but cannot be measured
The only thing not being measured is descriptions of behavior

Answer:

d

Explanation:

qualitative data is typically descriptive data

The theory of natural selection states that

Answers

Answer:

Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes species to change and diverge over time.

Explanation:

Which is TRUE about prokaryotic cells?
A. They have membrane-bound organelles.
B. They are compler.
C. They have DNA,

Answers

The ANSWER to this question is

C. They have DNA

chapter 19 Complete evaluation of the placenta includes structural _____, _____, retroplacental appearance, and _______ of the cord

Answers

Answer:

Structural location, size, shape and consistency, retro placental appearance and umbilical cord.

Explanation:

Umbilical cord is covered by amniotic membrane. Complete evaluation of placenta includes observing its size, shape, location and consistency. The area between myometrium and placenta is retro placental.

indian National congress was founded. _______
a) 1877
b) 1915
c) 1885
d) 1947​

Answers

Answer:

{Indian National congress was founded in 1885.}

"Hope this Helpful."
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Apply the concept of sustainable development to harvesting
trees in the timber industry. How could trees be cut down without drastically impacting the forest ecosystems?

Answers

Answer:

You can cut down the trees without hurting the trunk

Explanation:

Trees can regrow from their trunks.

Answer:

timber industries needs to plant more trees to replace the ones they destroyed

Why is it important to avoid applying too much nitrogen fertilizer?

Answers

Explanation:

Why is it important to avoid applying too much nitrogen fertilizer?

Too much nitrogen can increase the salinity of soil.

What are the possible phenotypes of the children if the mother has Type O blood and the father has type AB blood

Answers

Answer:

Type A

Type B

Explanation:

Blood type in humans is controlled by a gene with multiple alleles. Alleles iA and iB are dominant over allele i but are codominant. This means that the following genotypes will give rise to the phenotypes as follows:

iAiA or iAi - type A

iBiB or iBi - type B

iAiB - type AB

ii - type O

According to this question, if a mother with Type O (ii) blood and a father with type AB (iAiB) blood are crossed, the following offsprings will be likely produced:

iAi, iAi, iBi, iBi

iAi - type A

iBi - type B

Hence, the possible phenotypes of the children will be type A and type B blood.

Which type of selection is also known as diversifying selection because it tends to favor the survival of two or more different phenotypes in a heterogeneous environment

Answers

Answer:

Disruptive selection.

Explanation:

Disruptive selection is also called diversifying selection because it favor the survival of two or more different types of phenotypes in a particular environment. Disruptive selection describes changes in population in which extreme values for a trait are favored whereas the intermediate values are less favored. Due to the increase the variance of the trait which leads to the division of population into two distinct groups.

The pharynx is the structure in the body that serves as a pathway of both air and food. How does the body make sure that food does not get into the lungs?

Answers

Answer: The body makes sure that food does not get into the lungs because the epiglottis closes the air pathway so that food will not enter it.

Answer:

food getting to the lungs will be aspiration

Explanation:

A flap of tissue called the epiglottis sits over the top of the trachea. This flap blocks food and drink from going down into the trachea when you swallow hence preventing food from getting into the lungs

give me brainiest please

White blood cells (WBCs) are more resistant to lysis than red blood cells (RBCs). When looking at a sample of blood for WBCs, what could you do to reduce interference from RBCs? Group of answer choices Mix the blood in a hypotonic solution, which will cause the RBCs to lyse. Mix the blood in a hypertonic solution, which will cause the RBCs to lyse. Mix the blood in a salty solution to cause the RBCs to lyse. Mix the blood in an isotonic solution and allow the WBCs to float to the top.

Answers

Answer:

The correct option is this: MIX THE BLOOD IN A HYPOTONIC SOLUTION WHICH WILL CAUSE THE RED BLOOD CELL TO LYSE.

In order to reduce interference from red blood cell, mix the blood sample with a hypotonic solution. Because the red blood cells has more solute concentration, water from the hypotonic solution will enter into its cells and with time the cells will burst since they do not have much resistance against lysis. The bursting of the cells will eliminate the red blood cells and leave you with white blood cell to work with.

Asexual reproduction differs from sexual reproduction in that Group of answer choices asexual reproduction utilizes DNA from two parents to code for traits in offspring. asexual reproduction occurs only in plants. asexual reproduction produces offspring containing DNA from only one parent. asexual reproduction only occurs in animals. asexual reproduction produces genetically diverse offspring.

Answers

Answer:

Asexual reproduction produces offspring containing DNA from only one parent.

Explanation:

Asexual reproduction produces offspring containing DNA from only one parent because in asexual reproduction, the organisms born or produced from a single parent. The offspring is identical to their parent and this process of asexual reproduction occurs in both plants and animals. Asexual reproduction produces identical not genetically diverse offspring in the end of the process.

Answer:

Because asexual reproduction results in the birth or creation of organisms from a single parent, the children created have DNA from just one parent. Both plants and animals can reproduce asexually, and the progeny are identical to their parents. Asexual reproduction ultimately results in identical, not genetically different, offspring.

Explanation:

edg 2022

A population of rabbits has individuals with fur coloring that ranges from white to brown. The population lives in a temperate deciduous forest where the summers are mild and average about 50°F. The winters are often below freezing.

If warmer temperatures last longer into the fall and the average temperature in the winter is getting warmer, what do you expect to happen to the population?
The percentage of the population with brown fur will decrease.
The percentage of the population with white fur will decrease.
The population will increase in size, but the color percentages will remain unchanged.
The population will decrease in size, but the color percentages will remain unchanged.

Answers

Answer:

The best option for this problem would be the second option: "The percentage of the population with white fur will decrease"

Explanation:

Think about animals up in the north. Most of them are white because it helps them blend in the snow. And so an increase in average temperatures would mean less snow time. This would mean that the white rabbits will be more vulnerable to attacks for a longer time period of the year compared to previous years with a short time period of being vulnerable.

Answer:

b

Explanation:

got it right on edge 2022

it gets published
:)

Answers

Answer:

resend again that question dear

Answer:

yes ir will be published

Explanation:

I guaranteed you

The direct source of energy for the production of oxygen by phytoplankton is
A. sunlight
B. heat
C. shrimp
D. water

Answers

Sunlight is the correct answer. Hope this helps; have a great day.

In recent history, humans have influenced which parts of life on Earth?
A. Almost none of it.
B. Life on land only.
C. Virtually all life on Earth.
D. Life in cities only.

Answers

C. Virtually all life on Earth.

They have affected nearly every life form.

I’ll give you the answer later

What are this liquid helium chemical and physical properties?

Answers

Explanation:

Helium is a colorless odorless gas. It is lighter than air. It is nonflammable and is only slightly soluble in water. It is chemically inert.

Which hypothetical antibiotic would treat bacterial infections by interfering with bacterial reproduction

Answers

Answer:

bacteriostatic

Explanation:

Bacteriostatic is a type of antibiotic that can treat bacterial infections because the this chemical attack on the reproductive system of bacteria so that they can't multiply or increase in number. This Bacteriostatic is a biological or chemical agent that prevent bacteria from reproducing by not directly killing them. Depending on their application, bacteriostatic is considered as  antibiotics and  disinfectants.

What are two ways in which white blood cells fight pathogens that have entered the body?

Answers

Answer:

They release anti-toxins, which neutralise effect of toxins produced by bacteria

They destroy pathogens is by engulfing/ingesting them.

What is the main element that stars are made of?

Answers

Answer:

"Stars are made of very hot gas. This gas is mostly hydrogen and helium, which are the two lightest elements."

What is a variegated leaf​

Answers

Answer:

The term, "variegated" is applied to a flower or, more often, a leaf that has more than one color. Most often, it will be two-toned (that is, bi-colored). Often this will mean the foliage is blotched, striped, or bordered with a lighter color than that on the rest of it (or vice versa). The term is also applied more broadly to a whole plant that bears such leaves or blossoms. The corresponding noun for this definition is "variegation."

System
Identify the function of the labeled structures.
A:
B:
B В
C:
D:
A

Answers

Answer:

A: D/

B: B/

C: C/

D: A/

Explanation:

i hope this is helpful^^

Answer:

The first is D

The second is B

The third is C

The last is A

Explanation:

I took the assignment. In fact I'm taking it right now at the moment

Select all that apply.

All cells have similar structures, including _____.

a plasma membrane
vacuoles
protoplasm
chloroplasts
cell wall
cytoplasm

Answers

All cells have similar structures, including

plasma membraneprotoplasmcytoplasm

name the various classes of algae given by F E Fritsch​

Answers

Answer:

1. Chlorophyceae

2. Xanthophyceae

3. Chrysophyceae

4. Bacillariophyceae

5. Cryptophyceae

6. Dinophyceae

7. Chloromonadineae

8. Euglenineae

9. Phaeophyceae

10. Rhodophyceae

11. Cyanophyceae or Myxophyceae.

Explanation:

Algae are a group of living organisms classified under the kingdom Protista. They exhibit unique characteristics such as mode of reproduction, type of pigment, food reserve material, locomotive ability etc.

A british scientist (botanist) named Felix Eugen Fritsch in 1935 classified algae into 11 different classes based on some of these characteristics. The classes of algae are as follows:

1. Chlorophyceae (green algae)

2. Xanthophyceae (yellow green algae)

3. Chrysophyceae

4. Bacillariophyceae (diatoms)

5. Cryptophyceae

6. Dinophyceae

7. Chloromonadineae

8. Euglenineae

9. Phaeophyceae (brown algae)

10. Rhodophyceae (red algae)

11. Cyanophyceae/Myxophyceae (blue green algae)

Describe the thickness of the uterus lining during
menstruation process.

Answers

Answer:

As the cycle progresses and moves towards ovulation, the endometrium grows thicker, up to about 11 mm. About 14 days into a person's cycle, hormones trigger the release of an egg. During this secretory phase, endometrial thickness is at its greatest and can reach 16 mm.

Explanation:

Answer:

During this timeframe, the uterus is in the proliferative phase. Estrogen induces growth of the functional layer of the endometrial lining, which enables it to grow from about 1-3 mm post cycle to 6-8 mm approximately. Days 12-16 of the menstrual cycle At this point, the endometrial layer is about 6-8 mm thick.

Explanation:

What is a niche?
A. A group of organisms that interact within an ecosystem
B. A group of organisms that produce fertile offspring
O C. All of the resources a species uses within its ecosystem
O D. The place where a particular plant or animal lives

Answers

A niche refers to all of the resources a species uses within its ecosystem. Details about a niche can be found below.

What is a niche?

Niche is a function within an ecological system to which an organism is especially suited.

The niche of an organism is responsible for the survival of that organism in a particular environment.

Therefore, a niche refers to all of the resources a species uses within its ecosystem.

Learn more about niche at: https://brainly.com/question/17438524

#SPJ1

what is cell wall ?

please help.​

Answers

Answer:

A cell wall is a structural layer found just outside the cell membrane that surrounds various types of cells. It may be robust, flexible, and even stiff at times. It functions as a filtration mechanism as well as providing structural support and protection to the cell.

Which greenhouse gas has an average lifetime in the atmosphere of a few weeks to thousands of years and is the largest contributor to climate change?

Answers

Answer:

Greenhouse gases from human activities are the most significant driver of observed climate change since the mid-20th century.1 The indicators in this chapter characterize emissions of the major greenhouse gases resulting from human activities, the concentrations of these gases in the atmosphere, and how emissions and concentrations have changed over time. When comparing emissions of different gases, these indicators use a concept called “global warming potential” to convert amounts of other gases into carbon dioxide equivalents.

Explanation:

Why does it matter?

As greenhouse gas emissions from human activities increase, they build up in the atmosphere and warm the climate, leading to many other changes around the world—in the atmosphere, on land, and in the oceans. The indicators in other chapters of this report illustrate many of these changes, which have both positive and negative effects on people, society, and the environment—including plants and animals. Because many of the major greenhouse gases stay in the atmosphere for tens to hundreds of years after being released, their warming effects on the climate persist over a long time and can therefore affect both present and future generations.

Answer: carbon dioxide

Explanation:

EDGE2020

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