The first line of defense in a herbaceous plant is the
a. cork.
b. epidermis.
c. parenchyma.
d. phloem
B
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If DNA repair mechanisms were perfect, which of the following would most likely result?
A. We would live forever. B. Evolution as we know it would stop because mutations are the only agent that gives us new genetic variation. C. The rate of evolutionary change would dramatically increase. D. Humans would stop aging, as aging is a collection of DNA mutations. E. All of the answer options are correct.
Pheromones ____
a. are signaling molecules that are used for olfactory communication between two different species b. are only used by invertebrates c. require a vomeronasal organ to be detected d. are signaling molecules used for olfactory communication between members of the same species e. are signaling molecules geese use for navigation
Land ecosystems lose nitrogen to the atmosphere through ____
a. decomposition b. ammonification c. soil leaching d. bacterial fixation e. denitrification
Normal skin microbiota are able to grow on the skin because they can thrive in the presence of
A) sebum. B) salt. C) keratin. D) sebum and salt. E) sebum, salt, and keratin.