A seed leaf, which is part of a flowering plant embryo, is called a _____
1.cotyledon
2.dermal tissue
3.ground tissue
4.meristem
1
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Consider a community in which the vaccination rate for measles is 99 percent. Ryan, a 2-year-old with leukemia, has not received the measles vaccination because of his immunocompromised status. Ryan is unlikely to get measles because
A. the measles virus does not typically affect children with leukemia. B. measles has been completely eradicated and is no longer a threat. C. there is substantial herd immunity in his community. D. he is protected by antibodies from his mother that crossed the placenta.
Land tetrapods evolved just prior to which
mass extinction?
a. Cretaceous b. Devonian c. Ordovician d. Permian e. Triassic
The sixth mass extinction event is due to the activity of ________.
Fill in the blank(s) with the appropriate word(s).
All bacteria have a cell membrane
a. true b. false