1. which of the following is true about the fossil record?
a. it shows the earth's climate has been constant throughout history.
b. it shows that all species found on earth today are identical to all their ancestors.
c. it is used to show that the youngest fossils will usually be discovered in the deepest layers of rock.
d. it provides clues about how organisms have changed over time.

The correct answer will be option D- It provides clues about how organisms have changed over time.

Explanation:

Fossils are the remnants of plants and animals which were present millions of years ago. Fossils are formed due to the deposition of sand, silt, clay and mud over the dead and decayed parts of plants and animals inside a water body.

Since fossils are the present form of the past organisms, they are used by the evolutionary biologists as evidence to study the history of life on Earth related to their evolution and relationship with the existing species.

Thus, option D is the correct options.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.