Why have populations of many ray-finned fish species decreased in recent years?
A) Pollution of their environment
B) Loss of their prey species
C) Overfishing by humans
D) Parasitism by lampreys
E) Bacterial disease
C
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In most plant-pollinator interactions, plants species are pollinated by
A) one animal species, and each animal species pollinates one plant species. B) one animal species, and each animal species pollinates multiple plant species. C) multiple animal species, and each animal species pollinates one plant species. D) multiple animal species, and each animal species pollinates multiple plant species.
Which form of transport requires the expenditure of energy?
A) Facilitated diffusion B) Active transport C) Passive transport D) Osmosis
In which gland do T cells undergo further maturation?
A) adrenal B) thyroid C) thymus D) pituitary
The midpiece of the mature sperm contains mitochondria that provide metabolic energy for the trip to the egg. Fructose (simple sugar) is used as fuel by the sperm. From where is this fructose secreted?
A) bulbourethral gland B) prostate gland C) seminal vesicles D) acrosome