The first life on Earth, a simple, single-celled prokaryotic bacteria, appeared on life approximately how long ago? A) 4 thousand years B) 4 million years C) 4 billion years D) 4 trillion years

Choose one renewable renewable resource and explain how it reduces global warming

How would a significant increase in the amount of cholesterol molecules affect the diffusion of water across the membrane

What is one phenotypic trait that is the same in Mom, sad, and Baby dragon?

What type of system emphasizes the importance of common ancestry

Gee's arm was cut during an industrial accident. the blood was pouring from the wound in spurts. which type of vessel was severed?

What do cells need to do between divisions to make sure that a full set of dna gets passed on to each daughter cell?

True or false: The central nervous system allows us to sense the environment

Which of the following statements is false regarding root hairs? a. they are outgrowths of endodermal cells c. they increase the surface area of the root b. they are outgrowths of epidermal cells d. they absorb water and nutrients

Why is it critical to divide the chromosome number in half?

The amino acid proline is one of the three amino acids that watson describes as having "special properties". what is special about proline?