A male has a genotype RrTt. What is the probability of his producing Rt sperm cells?
A. 0%
B. 25%
C. 50%
D. 100%
B. 25%
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Select the incorrectly-matched vertebrate and its urine concentration relative to its blood.
A. amphibians—isotonic B. desert mammals—strongly hypertonic C. marine mammals—strongly hypertonic D. marine reptiles—isotonic E. terrestrial birds—weakly hypertonic
Why aren't insect tracheae associated with capillary beds?
A. Insects have an open circulatory system. B. Insects have external gills associated with hemolymph vessels. C. Insects use an air sac respiratory system. D. Insect capillaries are found only around the gut.
__________ refers to nutrient enrichment of any ecosystem that is otherwise low in nutrients. Fill in the blank(s) with the appropriate word(s)
Genetic diversity in bacteria is created by mutation and ________.
Fill in the blank(s) with the appropriate word(s).