Under which conditions do most types of cells function at optimal levels? A.
over a wide range of temperatures and pHs
B.
at any temperature and pH
C.
within a narrow range of temperature and pH
D.
in rapidly changing temperatures and pHs

the answer is c within a narrow range of temp and ph

Which of the following is a difference between a food chain and a food web? selected: a. food webs contain both plants and animals. food chains only contain animals.this answer is incorrect. b. food webs show energy transfer. food chains show which animal eats which animal. c. food webs separate organisms by tropic level. food chains do not. d. food webs are a complex patterns of energy flow. food chains only show one line of energy flow.

Which is the best way to define a common in environmental science a. a worthless resource b. shared resource c. a rare resource d. a typical resource

Which direction does the energy flow in this energy pyramid ?