Which tissue layer do triploblastic animals have that diploblastic animals do not?
a) endoderm
b) mesoderm
c) ectoderm
Ans: b) mesoderm
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Numerous hypotheses have been proposed for the mass extinction of about 60% of all species, including nearly all the dinosaurs, about 65 million years ago. Evidence has been found of the impact of a large meteor at about the time of this mass extinction. The amount of dust and debris put into the atmosphere upon impact, as well as atmospheric heating, would have been enormous. Using your knowledge of photosynthesis, speculate about why the dinosaurs subsequently became extinct.
What will be an ideal response?
Which of the following lipids makes up most
of a plasma membrane?
a. phospholipids b. cholesterol c. triglycerides d. steroids e. more than one of these
An example of an animal that has a nerve net of interconnected neurons instead of a brain is a(n) ____
a. planarian b. earthworm c. grasshopper d. sea anemone e. squid
The majority of phyla from domain Bacteria were discovered by
a. sequencing isolates cultivated in laboratory media. b. sequencing DNA extracted directly from environmental samples. c. using enrichment media. d. transmission electron microscopy.