Which of the following are true about ecosystems? Check all that apply.
_____ They contain both living and nonliving components.
_____ There is a transfer of energy through the system and some energy is lost as heat energy.
_____ Nutrients repeatedly cycle through the ecosystem.
_____ They represent the lowest level of biological organization.
_____ The ultimate source of energy for most ecosystems is the sun.
__X__ They contain both living and nonliving components.
__X__ There is a transfer of energy through the system and some energy is lost as heat energy.
__X__ Nutrients repeatedly cycle through the ecosystem.
_____ They represent the lowest level of biological organization.
__X__ The ultimate source of energy for most ecosystems is the sun.
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When a planarium is cut in half, a head will regenerate from the wounded anterior end and a tail will regenerate from the wounded posterior end. This is an example of
A. conditional specification. B. autonomous specification. C. fate mapping. D. Spemann's organizer. E. transforming growth factor.
When blood glucose is low, alpha cells secrete __________, which calls for glycogen breakdown and
glucose release by the liver. Fill in the blank(s) with the appropriate word(s).
An ancestral species and all its evolutionary descendants define a(n) ________
A) outgroup B) clade C) genus D) ingroup
The following model depicts a Wright–Fisher population. In which of these transitions does genetic drift operate?
a. parentals to very large gamete pool b. very large gamete pool to gamete pairs c. gamete pairs to offspring d. All of the above e. None of the above