The ________ are the male gonads.

A) scrotum
B) testes
C) urethra
D) penis


B) testes

Biology & Microbiology

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Populations in which individuals repel each other because resources are in short supply tend to have ____ dispersion

a. random b. clumped c. uniform d. dynamic e. unpredictable

Biology & Microbiology

Apple maggot flies appear to be two separate races. What makes these races different?

A) They look different. B) They eat different foods. C) They have different allele frequencies. D) They mate at different times.

Biology & Microbiology

Which structure is incorrectly paired with its tissue system?

a) companion cell - ground tissue b) palisade parenchyma - ground tissue c) guard cell - dermal tissue d) tracheid - vascular tissue e) root hair - dermal tissue

Biology & Microbiology

If the apical ectodermal ridge is surgically removed from an embryo, it will lose _____

A) positional information for limb-bud pattern formation B) guidance signals needed for correct gastrulation C) unequal cytokinesis of blastomeres D) the developmental substrate for the kidneys

Biology & Microbiology