Chemistry Middle School

The oldest fossils and evidence of modern humans on earth are around 200,000 years old. Before that time lived the ancestors of modern humans and Neanderthals. If all of earth’s history was compressed into 12 hours, what time would you first see modern humans?

Answers

Answer 1

Answer:

I would say around the 11th or 12th hour

Explanation:

seeing as the question calls for ALL of earth's history compressed into 12 hours the timeline should be similar to this: Earth was born at midnight, at around 2-3 AM land masses form, Right after that, life begins, For around 8 hours (11 PM) life is confined in water, right after that we have plants, 22 minutes later we have dinosaurs, 22 minutes later we have mammals, 5 minutes later dinosaurs are extinct, 6 minutes later we have people. So it's most likely the 12th hour. I hope this helps.

Answer 2
you would see modern humans in the last hour, specifically possibly closer to the last couple of minutes if the earth really is as old as scientists predict

Related Questions

If Enough Thermal energy And change of state, write each sentence.
Write (solid), (liquid), or (gas) to complete each sentence
If enough Thermal energy is added to a liquid, it will change to a

___________

Please explain in simple terms.
Spam = remove
Googling it = Remove

Answers

Answer:

If enough thermal energy is added to a liquid lets say cold it will freeze turning it into a solid. they same for a solid if enough thermal energy is added it can turn to a liquid or a gas.

Explanation: Its science.

Answer:

gas

Explanation:

I don't know, just it is gas bc the atoms gain space and move freely and yeah

A scientist designs some experiments to record how various substances change. She then reviewed her results. Which of the investigations listed below is an example of how the substance changed chemically?


Sodium metal reacts violently and explodes with water.


After heating aluminum in a crucible, it began melting at 1200 degrees F


Hydrochloric acid is stored inside plastic containers.


Grinding Copper sulfate allowed it to be dissolved much quicker.

Answers

Answer:

Sodium reacting with water and exploding.

Explanation:

the others are just melting, dissolving and storing a chemical. also I know its a chemical reaction because its the only answer that involves more than one chemical and has an actual change.

hope this helps :)

Elijah's car broke down. It takes 1400 Newtons
of force for the tow
-truck to pull his car. If
Elijah lives 800 meters away, how much work
will it take to tow his car home? If it takes him
40 minutes to get home, what is his average
speed? Force Distance Time Work Average
Speed

Answers

Answer:

2400 newtons.

Explanation:

Im not really sure, I just guessed?

What type of worm has a circulatory system?
Nematodes
Segmented worms
Roundworms
Flatworms

Answers

Your answer will be Segmented worms. Segmented worms have a closed circulatory system in which blood is enclosed in blood vessels.

Describe the concentration of hydronium ions and hydroxide ions when a base is added slowly to a white vinegar solution. The pH of white vinegar is 3.1.

Answers

Answer:https://brainly.com/question/22666401

Tis question is already answered my frnd

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