An event that is thought to have caused mass extinction is the impact of a giant ______.
What will be an ideal response?
meteorite
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___________________ are organisms that derive energy from sunlight
A. Phototrophs B. Autotrophs C. Heterotrophs D. Chemotrophs E. Lithotrophs
Based on the accompanying graph, which statement is accurate?
a. The primary response to the initial injection subsides after seven weeks.
b. The primary response to the initial injection peaks at 102 antibody units.
c. The primary response to the initial injection is faster, but not as intense as the secondary response.
d. The secondary response to the initial antigen is both faster and more intense than the primary response.
e. The primary and secondary responses to the initial antigen are about equal
A pair of chromosomes that contain alleles for the same genes at the same locations are
A. haploid. B. homologous. C. homozygous. D. synapsed.
Which of the following structures houses the corpus luteum?
a) ovary b) uterus c) vagina d) fallopian tube e) follicle