If you were asked to separate the reptiles from birds on the chordate family tree, which characteristic would you use?
1.flight
2.nurse young
3.endothermic
4.teeth
3
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The presence of hormones produced by the _________ _________ after implantation prevent menstruation.
Fill in the blank(s) with the appropriate word(s)
In the human body:
a. bacterial cells can survive only inside the eukaryotic cells. b. the diversity of bacterial cells living in the mouth is exceeded by the diversity living on the skin. c. there are more microbial cells than human cells.
Arthropods were able to move onto land because their ________ prevented dehydration and provided support
Fill in the blank(s) with correct word
Most vertebrates maintain homeostasis in regard to the total solute concentrations of their extracellular fluids and the concentrations of specific inorganic ions. The kidneys participate in regulating the extracellular fluid concentration of all ions below except
A. Ca2+ ions. B. Na+ ions. C. K+ ions. D. Fe2+ ions. E. Cl- ions.