Phillip was performing a laboratory exercise on how temperature affects a plant's cellular activity. he discovered that when exposed to high temperatures (around 50 degrees celsius), the overall rate of glucose production by photosynthesis decreased. which of these conclusions would best explain why this occurred? a) the high temperatures denature the proteins in the plasma membrane, thus making many of the cells unable to function properly. b) the higher temperatures hardened the plasma membrane not allowing glucose to leave the cell. c) the temperature decreased the availability of oxygen to the plant. d) as you increase the temperature, the plant cells go dormant. elimi

A.  If the optimum temperature for a cell's functions is exceeded, chemical reactions slow down as enzymes and other proteins begin to denature (change shape due to increased vibration of the atoms in the molecules that make up the proteins).

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".