Arthritis is a common result of aging, affecting persons' ability to ________
A) catch their breath after exercise
B) move their joints
C) heal broken bones
D) produce red blood cells
B
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The biological species concept relies primarily on the ability of individuals within the species to
a. adapt to the environment. b. have greater longevity. c. intermingle with other species. d. live in a variety of habitats. e. produce fertile offspring when mating with one another.
Cores of coral reefs show a reef base that is well below the photic zone. How are two ways that is this possible, given the light limitations of reef-forming corals?
What will be an ideal response?
Nephridia are
a. circulatory organs. b. respiratory organs. c. excretory organs. d. endocrine organs. e. part of the nervous system
The helminth parasite Schistosoma
A. is a cestode. B. has snails as intermediate hosts. C. has proglottids. D. is a roundworm. E. has fish as intermediate hosts.