What stomach secretion is necessary for normal hemoglobin production in RBCs?

A. HCl

B. pepsinogen

C. intrinsic factor

D. gastric lipase

Which of the following is true of secondary endosymbiosis? It is indicated by the presence of a double membrane surrounding the endymbiont. An organism containing one endosymbiont engulfs another organism, and that organism becomes an endosymbiont.

Any electricity charged object creates an electric field. Walking across carpet in wool socks can create an electric charge. This observation is evidence for which characteristics of electrical forces? A) They generate electricity by contact.

Which of the following foods is the most nutrient-dense per serving? olive oil, french fries, grape juice, soy milk?

Taconite is a low-grade iron ore that is found around Lake Superior. The iron-bearing rock is found interlaced with quartz, chert and other minerals.

Which of these accurately describes a scientific theory? Select one: A. Theories are statements that describe some aspect of the universe. B. Theories are broad explanations based on many observations and experimer C.

Linnaeus's significant development to modern taxonomy is

What does the term natural selection mean

Is the earth's heat budget balanced?

How can longshore currents be dangerous to swimmers?

Human blood consist of blood groups A, B, & O. However, there is one more blood group, AB, which contains alleles A and B in the same genotype. What is this phenomenon called?