How do vaccines cause the immune system to react

Why are enzymes needed in the body?

Which gas in the atmosphere made the development of eukaryotic cells possible? A. methane B. nitrogen C. oxygen D. carbon dioxide

Members of which of the following groups have an internal skeleton arachnids insects sea stars centipedes

All genetic differences aong organisms originate as some kind of Mutation Polypeptide DNA Gene

1. Some worms eat at night (meaning they are nocturnal) and some worms eat during the day (meaning they are diurnal).

How is decaying organic matter important to the carbon cycle? 1. It produces fossil fuels that store energy 2. It fixes carbon from the atmosphere 3. It transfers usable carbon from plants to animals 4. It returns carbon to carbon dioxide gas

What happens to the tempeture as you travel from the surface of the earth to the center

The major effect of genetic drift is: A) The reduction in genetic variability B) An increase in genetic variation to accommodate changes in abiotic conditions C) no change in population size but an increase in favorable alleles D) a reduction in

List some ways of plant cells are made of cellulose

Prokaryotic cells have a simpler structure than eukaryotic cells. Evidence shows that eukaryotic cells evolved from prokaryotic cells. Some might argue that prokaryotic cells are less important than eukaryotic cells.