Phloem sieve-tube elements are able to remain alive because adjacent ________ cells provide nourishment in the form of proteins and high-energy compounds such as ATP
Fill in the blank(s) with correct word
companion
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Which of the following regions of the human brain is critically important for monitoring and controlling movements?
A. medulla oblongata B. cerebellum C. hypothalamus D. basal nuclei E. cerebral cortex
One extreme variation of a phenotype will be
found during which type of selection?
a. stabilizing b. directional c. disruptive d. frequent e. mutational
A well-known example of natural selection in action is the change in the peppered moth population in England in the nineteenth century. The moths blended in with their light-colored natural surroundings, but with increasing industrialization in England,
smoke began to pollute the foliage and darken the trees and rocks. Eventually, populations that were once mostly light colored became mostly dark colored. Using natural selection, propose a hypothesis that would explain why the moth population changed over time from mostly light colored to mostly dark colored. What will be an ideal response?
Which group of animals is the most recent to evolve?
A) reptiles B) amphibians C) invertebrates D) mammals