Explain two things we can learn from fossils. (3 points)

50 ! will mark !

need by !

Explanation:

We can determine how old they are based on the radioactive decay of isotopes and how weathered the rocks are on the inside and outside.

We can also learn what types of animals lived in that time, which animals came first by how deep the fossil is, and where they lived by the location of the fossil.

We can learn about when certain groups of  animals evolved and what their ancestors were like.

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(I put in 6 examples and reasons for extra help!)

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.