What are homologous structures, and how do they provide evidence for evolution?

Red light has a wavelength that is the most effective for triggering stomatal opening

____________________ Indicate whether the statement is true or false.

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. Heterozygous individuals have an advantage over individuals with two normal alleles. C. Individuals with two normal alleles have an advantage over heterozygous individuals. D. Individuals with two harmful alleles have an advantage over heterozygous individuals.

In the "typical" menstrual cycle, day 13 or 14 is when

A) the corpus luteum disintegrates. B) progesterone levels peak. C) menstruation begins. D) ovulation occurs. E) estrogen levels reach their lowest point.

The tree of life:

a. provides us with a map of the history of life. b. provides us with a map that reflects the process of descent with modification. c. connects evolutionary history to the current diversity of life on Earth. d. All of the above.