What kind of cell in the human body would have more mitochondria- muscle cell or skin cell

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird

How does climate change affect producers?