In the sigmoid growth curve, the number of individuals at any one time is indicated by what symbol?
A. ri
B. N
C. K
D. dN/dt
E. N/K
B. N
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Freshwater sponges reproduce asexually by forming resistant internal buds called
(a) spicules. (b) larvae. (c) ovaries. (d) gemmules.
Organisms belonging to the genus Legionella are:
a. gram-positive diplococci. b. gram-positive diphtheroid bacilli. c. gram-negative coccobacilli. d. faintly staining, thin gram-negative bacilli.
Which ecological role is least likely to be performed by bryophytes?
a. enhancing the water-holding capacity of garden soil
b. stabilizing soil surfaces with a biological crust in harsh places c. supplying a food source for animals in the arctic tundra d. providing pollination services for agricultural crops e. helping to build soil on bare rock
Haplogroups consist of
A) sets of species that share a recent ancestor. B) the set of Y chromosomes in a population. C) groups of SNPs that are linked on a chromosome. D) preserved gametes, which are haploid.