Earthworms have no lungs or gills. Do they "breath"? If not how do they obtain oxygen to survive

What is complementary base pairing? Explain why complementary base pairing is necessary to maintain the double helix shape of the DNA molecule.

Snake bite antivenin is an example of a) active immunity b) passive immunity c) acquired immunity d) inborn immunity

Which of the following is a function of the spleen? a. Cleanses the interstitial fluid b. Circulates the lymph c. Removes worn out red blood cells d. Stores platelets e. Both a and b f. Both c and d g. Both a and c h. Both b and d

How is dna passed to new cells during cell division?

How do enzymes affect chemical reactions and activation energy?

How can individuals play a role in the evolution of an entire species

Which of these are found in the lymph? A. red blood cells B. white blood cells C. antibiotics D. platelets

The visual predation hypothesis proposes that:a) better vision allowed for better access to fruits and small insects b) primate traits arose as adaptations to preying on insects and small animals c) species could see predators from farther away,

A researcher wants to know whether children eating a high-protein breakfast will have a higher test grade. half of the children in the study eat a high-protein breakfast while the other half eats their normal diet.

What is the mass of an atom that has 4 protons, 5 neutrons and 4 electrons? 5 8 9 13