What pigment is used in human vision?

A) chlorophyll a

B) beta-carotene

C) retinal

D) vitamin A

E) ferredoxin

Why is a classroom door knob the least infected place in a classroom?

Which statement accurately describes natural selection

A client is admitted to the hospital with severe renal colic caused by a ureteral calculus. later that evening the client's urinary output is much less than the intake.

How are plants and fungi similar? How are they different?

In the ___ stage of general adaption syndrome the body is working at a much increased level of resistance, using resources until the stress ends or the resources run out

What does pollutant mean

Factors to be considered when replacing a tissue in the body

What are some science skills you could use to study fish in a aquarium

What happens when you increase a muscle's endurance? A) The length and flexibility of the muscle is increased. B) The overall strength of the muscle is increased. C) The thickness and size of the muscle is increased.

Which biome would contain the most trees? a tundra b grassland c desert d taiga