The first group of cells to migrate through the blastopore will become
A. neurons of the brain.
B. neurons of the peripheral nervous system.
C. notochord.
D. epidermis.
E. yolk plug.
C. notochord.
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In asexual reproduction, new combinations of genes arise by
a. mutation. b. random segregation of chromosomes into gametes. c. random assortment of gametes. d. crossing over. e. new combinations of genes do not occur.
Mammalian, bird, and crocodile hearts have four chambers with two separate atria and ventricles to ensure _____ different circuits for blood flow.
A. two B. three C. four D. eight
As plant cells rely on energy obtained directly from the sun to carry out any cellular processes, sugars are only used as backup energy sources for plants on cloudy days.
a. true b. false
_____ have 46 chromosomes, whereas _____ have 23
Fill in the blank(s) with the appropriate word(s).