Which statement is true about scientific questions?

They come from recognized knowledge gaps.

They are driven by societal needs and not by curiosity.

They must answer multiple things at the same time.

They are rigid and cannot be modified.

Which statement describes many of the structures involved in the first line of defense of the immune system? They have contact with the external environment. They are internal and contact the pathogen through blood.

What is the one way nitrogen may be returned to the air?

In a chemical reaction, a reacant binds to an enzyme at a reguon know as the?

Is carbon dioxide passive or active transport

Consider three molecules, named X, Y, and Z. When added to a beaker of water they undergo spontaneous reactions.

How does a virus cause disease?

Excretion of wastes is important to maintaining homeostasis. which three are involved in the excretion of wastes in humans? A. Urinary, skeletal, reproductive B. Circulatory, integumentary, Muscular C. Digestive, respiratory, urinary d.

How can we predict which elements are stable under natural conditions and which elements tend to undergo chemical reactions

Homologous sequences: A. are expected to have very similar sequences in related organisms B. are expected to have similar sequences in related proteins but from unrelated or distantly related organisms C.

What is the result of meiosis I and are the chromosomes replicated or unreplicated?