Which hormone is involved in maintaining the gamete or egg cell in females?
A. estradiol
B. progesterone
C. gonadotropin-releasing hormone
D. follicle-stimulating and luteinizing hormones
E. All of the choices are correct.
E. All of the choices are correct.
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Which of the following support(s) the observation that herbivores do not generally eat all of the available plants?
I) top-down control hypothesis II) poor nutrition hypothesis III) plant-defense hypothesis A) only I B) only II C) only III D) only II and III E) I, II, and III
Trichoplax adhaerens resembles?
a. snail b. sea anemone c. sea star d. sponge e. a hairy sticky plate
Concerning the sex chromosomes, which of the following is correct?
a. The Y chromosome carries a greater number of nonsexual traits. b. X and Y are different in size but carry nearly equal numbers of genes. c. The X chromosome carries more genes for nonsexual traits. d. The X chromosome carries only gender-related genes. e. The X chromosome carries the SRY gene.
Briefly explain the iron-sulfur world hypothesis and identify two pieces of evidence that support this hypothesis. What will be an ideal response?