Answer:
I think that the answer might be b and c
Answer:
It's D, protons. hope this helps you :)
Mercury, Venus, Earth, and Mars are all known as terrestrial planets I believe.
Answer:
A) A process that moves molecules from high concentration to low concentration.
By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. This is why scientists cannot be certain about how life began.
