Why are large amounts of red meat and butter not healthy choices in the diet?
A) They contain a lot of saturated fat. B) They contain too much protein.
C) Most people cannot digest them. D) They contain excessive amounts of fiber.
Answer: A
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To survive, an animal needs all its sensory receptors working, and even then, it cannot fully sense the external environment. What extra sensory receptors do you think would be advantageous to the survival of humans in this modern world?
What will be an ideal response?
In a pond, tadpoles eat algae and fish eat the tadpoles. Above the pond, grasshoppers eat grass and, at night, are preyed upon by bats. Other bats eat the fish that eat the tadpoles. In this community, the tadpoles are:
A. primary producers. B. primary consumers. C. secondary consumers. D. tertiary consumers. E. detritivores.
Countercurrent exchange allows for the removal of ____ of O2 from water flowing over gills
a. 50?60 percent b. 60?70 percent c. 70?80 percent d. 80?90 percent e. 90?100 percent
In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone. Why?
A. Individuals with two harmful alleles have an advantage over individuals with two normal alleles. B. Individuals with two harmful alleles have an advantage over heterozygous individuals. C. Heterozygous individuals have an advantage over individuals with two normal alleles. D. Individuals with two normal alleles have an advantage over heterozygous individuals.