It is difficult to pinpoint when the first terrestrial plants appeared because early plants lacked spores
Indicate whether the statement is true or false.
F
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Which of the following is the supportive element of hydrostatic skeletons?
A. a mineral matrix B. a hard outer covering C. a fluid-filled body cavity D. contractile proteins
The distribution of cytoplasm to daughter cells is
accomplished during a. prokaryotic fission. b. mitosis. c. meiosis. d. cytokinesis. e. karyokinesis.
Ozone molecules in the stratosphere shield the Earth from damaging UV radiation
___________________ Indicate whether the statement is true or false.
The figure shows a simplified phylogeny of closely related species of primates. This tree was proposed by comparing DNA sequence changes in the gene for cytochrome oxidase subunit II. The vertical scale represents time and the branch points represent common ancestors. What species did ancestor B give rise to?
A. All of the species except siamangs. B. Siamangs and orangutans. C. All of the species except siamangs and pigmy chimps. D. All of the species except orangutans. E. Gorillas, humans, and both types of chimps.