An Earth scientist is testing how various soil mixtures affect plant growth. She begins with 10 soil types. For each mixture, she combines equal amounts of 2 soil types. How many soil mixtures must the scientist create in order to test all possible combinations of the 10 soil types?a. 20b. 45c. 55d. 90
Answer:
b
Explanation:
The correct answer would be 45.
Assuming that the 10 soils are each represented by A, B, C, D, E, F, G, H, I, J.
A can combine with 9 others as: AB AC AD AE A F AG AH AI AJ
B can combine as: BC BD BE BF BG BH BI BJ
C as: CD CE CF CG CH CI CJ
D as: DE DF DG DH DI DJ
E as: EF EG EH EI EJ
F as: FG FH FI FJ
G as: GH GI GJ
H as: HI HJ
I as: IJ
Adding all the combinations together = 45
In other words;
[tex]^{10}C_2[/tex] = [tex]\frac{10!}{(2!(10 - 2)!)}[/tex] = 45
The soil mixtures must the scientist create in order to test all possible combinations of the 10 soil types- b. 45.
Given
soil samples = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
each mixture must have two sample
SolutionWe have to mix 2 soils in equal amounts. Then, the total number of possible soil mixtures are:-1 and 2, 1 and 3, 1 and 4, 1 and 5, 1 and 6, 1 and 7, 1 and 8, 1 and 9, 1 and 10 = >92 and 3, 2 and 4, 2 and 5, 2 and 6, 2 and 7, 2 and 8, 2 and 9, 2 and 10 => 83 and 4, 3 and 5, 3 and 6, 3 and 7, 3 and 8, 3 and 9, 3 and 10 => 74 and 5, 4 and 6, 4 and 7, 4 and 8, 4 and 9, 4 and 10 => 65 and 6, 5 and 7, 5 and 8, 5 and 9, 5 and 10 => 56 and 7, 6 and 8, 6 and 9, 6 and 10 => 47 and 8, 7and 9, 7 and 10 => 38 and 9, 8 and 10 => 29 and 10 => 1Then Total mixtures possible are =
9 + 8 + 7 + 6+ 5 + 4 + 3 + 2 + 1
= 45
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What do all organisms need? Select three options.
O nervous system
O a place to live
O blood
O water
O food
Answer:
Explanation:
A place to live water and food is the correct answer
The three selected options are place to live, water and food.
What is biological need?
The physical conditions needed for survival of organisms are referred to as biological needs. The same applies to human body which cannot operate and will ultimately fail if these conditions are not satisfied.
All organisms really want five things for survival: fresh air, clean water, food, shelter, and sleep.
Biological needs are important because they are essential to survival. Without air, sunlight, food, water, shelter, sex etc. organism cannot or it is hard to survive.
Thus, the three selected options are place to live, water and food.
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#SPJ2
______ form the bulk of the cell structure and most functional molecules
A protein
B molecules
C fats
D vitamins
Answer:
A protein
Explanation:
Eugene is running and needs more energy. He drinks a sports drink with sugar, but that sugar needs to be converted to another substance containing chemical energy for his leg muscles to be able to use it. Which process will convert the sugar to energy that his cells can use? cellular respiration photosynthesis breathing energy storage
Answer: i put cellular respiration
Explanation:
currently taking the quiz i’ll see if it’s correct
Answer:cellular respiration
Explanation:
its A becase cellular respiration that do what the Question is asking
Your umbilicus (bellybutton) is (anterior/posterior) to your tushy.
Answer:
i did not understand
Explanation:
17.Addition of hydroxide ions to a solution will Select one : O have no effect on acidity OB increase the acidity O C. buffer the solution . O D. decrease the acidity
Answer:
D
Explanation:
Hydroxide ions make solutions more basic by decreasing its acidity (this is accomplished by reacting with H+)
how is this food made and what is the role of microorganism in the production of this food?
Answer:
Nature uses microorganisms to carry out fermentation processes, and for thousands of years mankind has used yeasts, moulds and bacteria to make food products such as bread, beer, wine, vinegar, yoghurt and cheese, as well as fermented fish, meat and vegetables.
Explanation:
what a b0nerr mean???????
Answer:
srry look it up I dont wanna get it trouble
Explanation:
Steps of the light-dependent reactions in order
sunlight photosynthesis
Explanation:
manufacture food theough sunlight
Which of the following best describes how does latitude affect biomes?
Latitudes affect how much rainfall a biome will receive.
Lower latitude biomes will always have high temperature.
Higher latitudes produce warm biomes.
Higher latitudes receive less sunlight producing cold biomes.
Answer:
Higher latitudes receive less sunlight producing cold biomes.
Explanation:
Regions with similar climates and plant types are called biomes.
Terrestrial regions may be classified as desert biomes, rainforest biomes, grassland biomes, temperature deciduous forest biomes, tundra biomes, northern coniferous forest biomes, savanna biomes, and mediterranean biomes.
Because these biomes are mostly defined in terms of dominant vegetation or plant species, they are determined by rainfall and temperature. In general, higher latitude biomes are further away from the equator, less sunlight and heat- this results in drier climates with less rainfall and lower, cooler, temperatures.
WILL GIVE BRAINLIEST PLZ HELP
5. Which of the following scenarios does not describe how body systems are dependent on one another?
A. Oxygen and nutrients are brought to the heart via blood.
B. White blood cells protect the brain from viruses.
C. Bones elongate from messages sent by hormones.
D. Glands keep skin moist.
Answer: Oxygen and nutrients are brought to the heart via blood.
Explanation:
List one change in behavior that you would reasonably expect in bug populations that have been living on golden rain trees.
Answer:
List one change in bug morphology and behavior that you would reasonably expect in bug populations that have been living on golden rain trees. Females will be the same size as males, and there will be less competition to reproduce early. 15. Bugs are small relative to their host plants.
Explanation:
Brainliest please?
How do proteins play an important role in the mating of japanese beetles
Nervous
Match each body system with Its main organ.
Circulatory
Digestive
Lungs
Excretory
Heart
Respiratory
Brain
Stomach
Bladder
Suppose that Rosie and Ross are both carriers for PKU (a rare autosomal recessive disease.) If they have eight children, what is the probability that all of eight children will have the same phenotype?
Answer:
1/65,536 = 0.001523 %
Explanation:
A: normal allele
a: recessive allele causing PKU
The probability that Rosie and Ross have one child with PKU will be >>
Aa x Aa = 1/4 AA; 1/2 Aa; 1/4 aa
In consequence, the probability that Rosie and Ross have eight children with PKU will be >>
(1/4)⁸ = 1/65,536 = 0.001523 %
If Rosie and Ross are carriers of PKU, if they intend having 8 children, the probability that they will all have the same phenotype is: [tex]\mathbf{\frac{1}{65,536}; 0.001523 \%}[/tex]
Given that Rosie and Ross are both carriers of the recessive disease, it means that for the disease to manifest itself, two recessive alleles must be present in an allelic pair.
Using P and p to denote the dominant and recessive alleles respectively, we have the following gene of both parents:
Rosie - PpRoss - PpThe cross between both parents has been provided using a Punnett square as shown in the attachment.
The cross shows that, for any cross between both parents, there is [tex]\frac{1}{4}[/tex] probability that the child would have the phenotype, pp, which means the child would have the are autosomal recessive disease.
Therefore, the probability for for 8 children having the same phenotype will be:
[tex]\frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} = \frac{1}{65,536}[/tex]
This is also approximately: [tex]\frac{1}{65,536} \times 100 = 0.001523 \%[/tex]
Therefore, if Rosie and Ross are carriers of PKU, if they intend having 8 children, the probability that they will all have the same phenotype is: [tex]\mathbf{\frac{1}{65,536}; 0.001523 \%}[/tex]
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HELP QUICK If a scientist is exploring the surface of a moon during a space mission, what will most likely be found?
The fifth largest moon in the solar system, Earth's moon is the only place Potential for Life? missions that will enable human exploration of the Moon and Mars. A total lunar eclipse occurs when the Moon and Sun are on opposite from around the edges of the Earth, as seen from the Moon's surface. If Earth were the size of a nickel, the Moon would be about as big as a coffee bean. It is most likely made of minerals like olivine and pyroxene, which are made was made in 2008 by the Indian mission Chandrayaan-1, which detected Scientists also found the lunar surface releases its water when the When imagining locations where extraterrestrial life could potentially dwell, few Over the last fifty years, various missions to the red planet have sought to "This deposit is probably more accessible than most water ice on Mars, Scientists also found structures resembling fossilized nanobacteria on the.
In a population, there are 500 cats. What is the frequency of black cats if 300 are calico?
Answer:
2 out of every 5 or 2/5
Explanation:
there are 200 black cats because there are 300 calico there are 500 total so it would be 200/500 or 2/5
True or False: All viruses look the same. А True B False
Answer: False
It is not true
Answer:
B False
Explanation:
Why is phenylketonuria resulting from dihydropteridine reductase deficiency a more serious disorder than PKU resulting from phenylalanine hydroxylase deficiency?
Answer:
pteridine reductase deficiency alters all reactions known to be dependent on tetrahydrobiopterin (BH4)
Explanation:
Hyperphenylalaninemia is a condition characterized by elevated concentrations of the amino acid phenylalanine in the blood. Dihydropteridine reductase deficiency (DHPR) is a severe type of hyperphenylalaninemia caused by the deficiency of tetrahydrobiopterin (BH4). BH4 helps to convert amino acids, including phenylalanine, to precursors of neurotransmitters. BH4 is an essential non-protein co-factor of enzymes associated with the biosynthesis of dopamine, serotonin, noradrenaline and adrenaline. DHPR is an inherited recessive disorder whose symptoms include mental deficiency, poor swallowing (dysphagia) and an abnormally small skull (microcephaly).
Primary and secondary succession why and how do they happen and what occurs during each?
Explanation:
In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area that was previously occupied by living things is disturbed, then re-colonized following the disturbance.
If a plant has the TtSs genotype, what would the genotypes of its gametes be?
A. Tt, Ss, TS, and ts
B. TT, tt, SS, and ss
C. TS, Ts, tS, and ts
Which characteristic is most suitable to use to create a question for a dichotomous key?
whether an organism is eating
whether an organism is flying
whether an organism is striped
whether an organism is pregnant
Answer:
C
Explanation:
please help ill give brainliest
Answer:
amoeba: 1 mutation
sponge: 1 mutation
earthworm: 4 mutations
shark: 5 mutations
lizard: 5 mutations
kangaroo: 5 mutations
dolphin: 5 mutations
Explanation:
Erosion is:
A.
the process of moving materials from their source to another location through weathering.
B.
the breaking down of rock soil and minerals.
C.
magma coming up from the Earth’s mantle through openings in the crust.
Answer:
uhhh maybe A..
Explanation:
in earth science, erosion is the action of surface area process that removes soil, rock, or dissolved material from location on the earth's crust, and then transports it to another location
Which of the following statements about anatomical position are true?
Anatomical position is different in different hospitals.
Anatomical position is not helpful when learning new terms in anatomy.
Anatomical position is a standard point of reference for the anatomical planes.
Superior and inferior planes describe parts of the body relative to anatomical position.
Answer:
its C and D
Explanation:
edge 2020
Anatomical position is a standard point of reference for the anatomical planes and Superior and inferior planes describe parts of the body relative to the anatomical position are true statements about the anatomical position.
Anatomical position is a term used in different areas of medicine to refer to a reference position on the directional terms used to describe parts and regions of the body.
The anatomical reference position is the one in which the body is:
In an upright posture standingThe upper extremities extended to the side of the trunkThe palms of the hands forward.Head and feet directed forward.Additionally, other terms such as superior and inferior planes are used to describe the position of the parts of the body concerning the anatomical position.
According to the above, answers C and D are two true sentences about the anatomical position.
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What is the name of the process shown in the picture below?
A) lipid metabolism
B) translation
C) DNA replication
D) transcription
Answer:DNA replication
Explanation:
Answer:
DNA replication
Explanation:
It looks to me that the top is the leading DNA and the bottom is the replication. The bottom is replicating the top (original)
9
1 point
After it falls as precipitation, water hits the earth as run-off or groundwater.
True
O False
True
Explanation:
Runoff is when water is basically "Running off" and groundwater is water found underground
How do enzymes affect a chemical reaction, making it easier to occur?
Answer:
Enzymes speed up a chemical reaction making the reaction easier to occur.
what is the type and morphology of Escherichia coli
Answer:
E. coli is a Gram-negative, facultative anaerobe (that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to fermentation or anaerobic respiration if oxygen is absent) and nonsporulating bacterium. Cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter, with a cell volume of 0.6–0.7 μm3.
E.coli colonies on agar.
E. coli on sheep blood agar.
E. coli colonies
E. coli growing on basic cultivation media.
E. coli stains Gram-negative because its cell wall is composed of a thin peptidoglycan layer and an outer membrane. During the staining process, E. coli picks up the color of the counterstain safranin and stains pink. The outer membrane surrounding the cell wall provides a barrier to certain antibiotics such that E. coli is not damaged by penicillin.Strains that possess flagella are motile. The flagella have a peritrichous arrangement.It also attaches and effaces to the microvilli of the intestines via an adhesion molecule known as intimin.
Explanation:
PLEASE HELP ME WITH THIS QUESTION
Answer:
mitochondiria
Explanation:
The mitochondria produces ATP, which is chemical energy used in cellular respiration and it is sknown as the power house of the cell
Answer:
mitochondiria
Explanation: