The first antibody secreted upon exposure to an antigen.
What will be an ideal response?
IgM
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Which of the following would protect a plant from water loss on a hot, sunny day?
A. phloem and stomata B. cuticle and stomata C. cuticle and phloem D. stomata E. cuticle
Humus includes all of the following EXCEPT
a. feces. b. dead organisms. c. leaf litter. d. weathered rock. e. decomposing organic matter.
In comparison to desert habitats, urban landscapes on average have a
A) higher number of bird species. B) lower number of bird species. C) similar number of bird species. D) the same type of bird species.
The term evolution is used to describe
A. the ability of an individual organism to pass on what it has learned, through experience, to the next generation. B. any change in an individual that can be observed. C. heritable changes in characteristics of a population from one generation to the next. D. any change in an individual organism that occurs in somatic cells. E. changes in the number of individuals in a population due to mating.