In ponds and lakes, the zone beneath the depth of effective light penetration but above the bottom is referred to as the
A) littoral zone.
B) limnetic zone.
C) profundal zone.
D) benthic zone.
C
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Which species might experience reproductive isolation if all bees in the area were eliminated by disease?
a. brown bats b. coffee ferns c. almond trees d. dragonflies
In this equation p2 + 2pq + q2 = 1, what does the term 2pq represent?
A. The genotype frequency of homozygous recessive individuals B. The genotype frequency of homozygous dominant individuals C. The genotype frequency of heterozygous individuals D. The sum of the phenotype frequencies in the population
The evolution of biochemical molecules started on Earth ____.
A. after the appearance of prokaryotic cells B. long before any cells emerged C. after the appearance of eukaryotic cells D. after the appearance of eukaryotic cells but before the appearance of multicellular organisms E. after the appearance of multicellular organisms
Tubeworms around deep-sea hot vents house which symbiotic organism?
a) photosynthetic daphnia b) chemosynthetic bacteria c) algae d) sea lice