Which element is most important for adding strength to hair, feathers, and outer skin?

oxygen

hydrogen

sulfur

phosphorus

Which is the only mechanism that can introduce new alleles in a gene pool? A. Genetic drift. B. random mating. C. mutation

Video link: What is Natural Selection? 1. What do the call the idea that traits are passed down from generation to generation and sometimes undergo changes or modifications over time.

The main difference between a taproot system and a fibrous root system is that a. taproots can store a lot of food, while fibrous roots do not. b. taproots absorb water, while fibrous roots do not. c.

Why crossing over is an important process for genetic variation

Which of the following is a characteristic of a prokaryotic cell? It does not have a nucleus. It has membrane-bound organelles. It is larger in size than a eukaryotic cell. It is not present in unicellular organisms.

Why do decomposers break down plant and animal waste products? I will mark you as brainlist choose: To keep the nitrogen cycle going To produce ammonium To obtain energy

If I were to drop a needle on top of a bowl of water would it sink

What is a human activity that increases erosion.

Consider the following five infectious diseases: Ebola hemorrhagic fever avian influenza SARS West Nile encephalitis mad cow disease What do these diseases have in common?

Which organ plays a major role in assimilation of food monomers? a.) Pancreas b.) Stomach c.) Liver d.) Gallbladder