When you smile the is the primary muscle that elevates the corners of your mouth?

It has been proposed that mitochondria and chloroplasts are modern descendants of early prokaryotic cells that began to reside and gradually involved within prumitive cells which statement supports this View

The bottleneck effect is used to describe an event where a population decreases. One example involves the northern elephant seal. They have a reduced genetic variation due to a population bottleneck humans inflicted on them in the 1890s.

What are the main reasons forests are cut down?

How do mullusks differ from echinoderms? How are they similiar?

What are the structural units that make up ionic compounds and how are they named?

Size, shape, and position of grains that make up a rock

Which of the following statements cannot be tested by science?

Can you explain how salt from the sea is returned to the land

A species of rabbit is preyed upon by foxes, which are preyed upon by wolves. Humans decide to open a hunting season on the wolf population.

Nearly all nutrients present in tropical rainforest forests are contained in the