Which lineage includes members called lancelets?
a. Cephalochordata
b. Placodermi
c. Myxinoidea
d. Urochordata
Answer: a. Cephalochordata
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Each branch point or node of a phylogenetic tree represents:
A. an environmental pressure for evolution. B. a mutational event that leads to two species. C. common ancestor to two connected branches. D. the beginning of a new domain. E. the point when life started on earth.
A well-tested hypothesis that has not been disproved
is called a a. principle. b. law. c. theory. d. fact. e. hypothesis.
The condition where tissue from the uterine lining grows outside the uterus is called ______________
A. endometriosis B. pelvic inflammatory disease C. uterine prolapse D. ectopic pregnancy
Explain the mechanics of muscle contraction during a heartbeat, including the stimulus for the contraction
What will be an ideal response?