Which of these true statements could contribute to a plausible hypothesis for why the alternation of generations evolved in the earliest land plants? Select all that apply. Gametophytes lack the ability to form rigid (lignified) vascular tissues. It allowed one generation to specialize in fertilization and the other in dispersal. The biopolymer sporopollenin first evolved to protect the diploid stage of green algae. Many gametophytes tolerate desiccation.

Which of these is not a nucleotide base found in dna?

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.