Sexual dimorphism, as seen in the crayfish, is
(a) the presence of male and female individuals.
(b) the production of eggs and sperm by the same individual.
(c) another term for copulation.
(d) the presence of observable differences between males and females.
(b) the production of eggs and sperm by the same individual.
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The shark rectal gland _____
A) is involved in osmoregulation B) is responsible for excretion of undigested residue C) secretes a hypotonic solution D) concentrates electrolytes necessary for homeostasis in a hypertonic environment
Which is most likely to happen to a human polyploid?
a. natural abortion b. death around the age of 1 year c. survival until the early teens d. survival until the mid-thirties e. death around the age of 1 month
Foraminiferan shells are made of
A. cellulose. B. chitin. C. calcium carbonate. D. peptidoglycan. E. silica.
In photosynthesis, water is used as a source of replacement electrons for _______.
a) the Calvin cycle b) the citric acid cycle c) photosystem II d) the electron transport chain