____ is part of the chondrocranium that grows up and around the nerve cord forming an arch
Fill in the blank(s) with the appropriate word(s).
Answer: Occipital bone
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In the last 20 years one concern of scientists who study amphibians is that
A. genetic diversity is being increased too rapidly for proper maintenance. B. the edge effects are causing declines in species numbers. C. DDT is affecting reproduction by thinning the egg membranes. D. populations are diversifying rapidly and speciation is occurring. E. many species are declining or have gone extinct in recent years.
Four of the five drugs listed below are analgesics
Select the exception. a. endorphin b. opium c. heroin d. enkephalin e. Ecstasy
The initial carrying capacity of an environment is
indicated by a. A. b. B. c. C. d. D. e. E.
Why is the phospholipid bilayer considered semipermeable?
A. The hydrophobic tails act as a barrier to nonpolar molecules. B. The bilayer is a barrier to some, but not all, substances on either side of it. C. Large molecules can only pass through the layer of hydrophilic phospholipids. D. The bilayer is completely nonpolar, which prevents some molecules from passing. E. Small, nonpolar molecules do not pass through the phospholipid bilayer.