Which of an atom's subatomic particles are involved in chemical bonding? A. neutrons only B. valence electrons only C. neutrons and protons only D. protons and valence electrons only

What does lipase digest? A. Carbohydrates B. Proteins C. Fats

Fossil records show that the size of black bears in europe increased during each glacial period and decreased during the interglacial periods.

A student was reading a magazine about oceans. He read that there are large currents in the deep ocean that move water in the oceans around the world. Which of these best explains the formation of deep-ocean currents

One global warming prediction might be A) fewer climatic weather change events B) increased cases of malaria C) increased resources and plant growth periods D) lower overall coastal flooding events E) none of the above

8. What is nuclear fusion and how does our universe use it?

Which of these celestial bodies has a tail? a-asteroid b-comet c-moon d-planet

What is the function of myeloma cells used in the production of monoclonal antibodies?

Describe a simple nervous system. Give an example of an organism that has a simple nervous system.

An example of a parallel choice on a dichotomous key is

Describe one way the human respiratory system degrades over our lifespans, and explain one environmental condition that could cause an unnatural degradation as someone ages, including why that environmental condition harms their respiratory system.