Warm front is a(n) A. zone of extremely high temperatures
B. mass of cold air
C. area of contact where warm air gains ground over a cold air mass
D. blog area of contact where cold air gains ground over a warm air mass

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.