A(n) __________ has both biotic and abiotic components
a. population
b. community
c. ecosystem
d. species
e. genus
C
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Research has shown that commercial fisheries place selective pressure on fish populations by harvesting mostly the
____ fish, resulting in ____.
a. young; aging populations b. larger; maturity at smaller sizes c. smaller; maturity at larger sizes d. prereproductive; declining birth rates e. postreproductive; no change in population size
Organisms such as prokaryotes (bacteria and archaea)?along with some eukaryotes?reproduce asexually
In the case of bacteria and archaea in particular, which exchange DNA but do not reproduce utilizing conventional sexual reproduction, the BEST way in which to define species is with ________. A) the morphospecies concept B) the phylogenetic species concept C) the biological species concept D) an ecological species concept
A key component that is always important in the proper functioning of the immune system is:
a. direct cell to cell contact. b. hormonal action. c. communication between cells. d. antibody action. e. perforins
The stomach's gastric juice consists of ________
A) digestive enzymes only B) hydrochloric acid only C) digestive enzymes and hydrochloric acid only D) mucus, digestive enzymes, and hydrochloric acid