Explain why scientists think that life on earth began after 3.9 bya

Answers

Answer 1

Answer:

Answer:

Scientists found evidence such as fossils that were almost 4 billion years old, concluding that life on earth began after that.

Explanation:

Answer 2

Answer: They found fossils that were over years old

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Darwin collected an studied many specimens to understand natural selection on the Galapagos islands. which organisms did he study while he was there

Why's it possible for many different species to live together in one ecosystem?

Answers

They each adapt to eachother

Answer:

Individual organisms live together in an ecosystem and depend on one another. In fact, they have many different types of interactions with each other, and many of these interactions are critical for their survival.

if i had an 87.29% grade in a class because i turned in an assignment late and i got 5 out of 10 on that assignment, what would that put my grade to?

Answers

it depends on how many points out of how many points you had to get the 87.29%

But I think your grade is a B....

89.95% and up = A
79.95% to 89.94% = B
69.95% to 79.94% = C

so yeah

A process of obtaining information by using the senses is called ______.

Answers

The process of obtaining information by using the senses is called observation.

- 4y – 7y² – 2y ² – 7 x 3 – 4y² + y²

Answers

Answer:

-7x^3 -12y^2-4y

Explanation:

The -7x^3 is alone so you don't have to worry about adding or subtracting it. You add -7y^2-2y^2-4y^2+y^2 together then you just put the -4y because it's alone.

Here is the answer to your problem

Explain why air is not a good conductor of heat.will give best answer brainlyest

Answers

Answer:

Air is a bad conductor because, to conduct heat current molecules should absorb heat and transmit it to neighbor by vibrating. So , "If air were a good conductor of heat" then soup will not stay hot for longer because this time convection+conduction will both help to transfer heat away from soup.

Explanation:

Convection requires the hot air just above your soup that has been heated up to rise as its density reduces after being heated, allowing the colder air around the rising hotter air to replace the hotter air and the same thing will happen again. As the convection currents (the rising of the hot air and the sinking of the cold air) keep taking place just above your soup, the previously hot soup will start to lose thermal energy (heat) and your soup will cool down despite the fact that air is a poor conductor of heat. In other words, cooling of your soup only takes place in convection due to the movement of air and not the heating up of air itself. As a result, if air was a good conductor of heat, it would not make a difference.

Hope this helps.

Need help ASAP!!!!! Will friend request and write something nice on wall.

Answers

the answer is the second one b

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