Similar patterns of character acquisition leading to complex multicellularity are seen in plants and animals
A. true
B. false
A
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______ do NOT depend on the circulatory system to deliver oxygen to the tissues.
A. Insects B. Molluscs C. Mammals D. Birds E. Amphibians
What evidence suggests when oxygen gas first
became a significant part of Earth’s atmosphere?
a. multi-celled microorganisms that breathed oxygen b. fossils of dinosaurs c. molten rock from volcanoes that were rich in oxygen d. rusty rocks indicating oxidized iron e. the presence of water vapor in the atmosphere
An individual that has two dominant alleles for a trait (AA) is __________. Fill in the blank(s) with the appropriate word(s)
Cells that insulate and speed impulse conduction between neurons in the PNS are
A. Schwann cells. B. nodes of Ranvier. C. astrocytes. D. oligodendrocytes.