Identify the best description of a heme group.
a. single metal atom bound to each of the four oxygen
b. binding parts of hemoglobin family of hormones that stimulate hemoglobin production under hypoxic conditions
c. one of four iron‑containing parts of hemoglobin that bind to oxygen molecules
d. multi-part protein that reversibly binds to oxygen molecules for transport in blood

Which statement best describes lactic acid fermentation? a. lactic acid fermentation is the first step of cellular respiration. o b. lactic acid fermentation is the final step of cellular respiration. re to berate c. in the absence of oxygen, cells release atp by breaking down lactose into glucose. e der lade res o d. in the absence of oxygen, cells release atp by breaking down glucose into lactate. ar

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Are the earth's ocean floor and continents the same age geologically? why or why not?