In a multicellular organism, cellular exchange with the environment can only occur if ________.
A) cells have access to a suitable watery environment
B) the body is a closed system
C) homeostasis requires energy expenditure
D) temperatures are variable
Answer is A) cells have access to a suitable watery environment
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Embryonic stem cells are harvested from the inner cell mass of an early stage embryo called a(n) ____________________
Fill in the blank(s) with correct word
Virulent as well as temperate phages can serve as generalized transducing phages
Indicate whether this statement is true or false.
A keystone species
a. has a disproportionately large effect on a community relative to its abundance b. controls the prey species. c. may increase or decrease the number of prey species in a community. d. has a disproportionately large effect on a community relative to its abundance, and may increase or decrease the number of prey species in a community. e. has a disproportionately large effect on a community relative to its abundance, controls the prey species, and may increase or decrease the number of prey species in a community.
Why is there no consistency in the screening of newborns in the United States?
a. Each state independently decides which tests to include. b. The March of Dimes only recommends 29 items for screening. c. For some disorders, we do not screen because there is no way to remediate the defect. d. Because there are simply too many.