Of the ph values below, which is considered "neutral" ph? a. 7.4 b. 9 c. 5.4 d. 7

How do high-energy electrons from glycolysis and the krebs cycle contribute to the formation of atp from adp in the electron transport chain? a. high-energy electrons interact with pyruvic acid to create a phosphate bond with adp, forming atp. b. high-energy electrons supply the needed energy to synthesize atp from the lower-energy adp in the electron transport chain. c. high-energy electrons supply a negative charge which causes the citric acid to oxidize, forming a phosphate group to bond with adp. d. high-energy electrons increase the temperature of adp so it easily reacts to form atp.

Awarm front often brings a. cirrus clouds b. fair conditions c. cool weather d. steady rain

Which of the various species concepts distinguishes two species based on whether genes are exchanged between their gene pools? a) phylogenetic b) morphological c) biological d) ecological