Secondary production is limited primarily by
A) water availability.
B) nutrient availability.
C) primary production.
D) light availability.
C
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The cell cycle is shown in this diagram. During which phase is the cytoskeleton dismantled?
a. G1
b. S
c. G2
d. Cytokinesis
Phagocytosis is a process used by cell to bring water into cells
a. true b. false
Sexual reproduction
a. leads to uniform characteristics in a population. b. results in new combinations of genetic traits. c. produces genetic clones. d. requires less tissue differentiation than asexual reproduction. e. produces genetic clones and requires less tissue differentiation than asexual reproduction.
________ proposed that polypeptides and RNA evolved simultaneously.
A. Graham Cairns-Smith B. Aleksander Oparin C. Thomas Cech D. Stanley Miller E. Sidney Fox