Three-spined stickleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets
Longer gill rakers appear to function better for capturing open-water prey, while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish? A) directional selection
B) stabilizing selection
C) disruptive selection
D) sexual selection
C
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What do NADH and FADH2 deliver to electron transfer chains?
a. electrons b. ATP c. oxygen d. electrons and hydrogen ions e. phosphate
The smallest unit of life is the _____
Fill in the blank(s) with correct word
Darwin's theory was strongly founded on the geographic distances traveled by migrating species, or occupied by their populations. A theory of "island biogeography" was introduced in 1967, further elaborating on importance of the distances traveled, or areas occupied by populations. A specialized field of "landscape ecology" concerns patches of habitat, and distances between them, along with movement corridors, or barriers to movement. With all of these, the individuals that move about and successfully reproduce in the population
A. can be aided by human construction of artificial corridors of movement, such as railways and roadways. B. can be blocked by human construction of cities, or modification of vast landscapes for agriculture. C. demonstrate gene flow that can counteract trends in selection and other allele frequency changes. D. can reunite smaller groups of the species population that were previously isolated. E. All of the answer choices are correct.
Most of the oxygen in the blood is transported by ____
a. erythropoietin b. prothrombin c. platelets d. hemoglobin e. leukocytes