He muscle which extends the arm while doing pushups is the

a.) deltoid
b.) pectoralis
c.) brachialis
d.) triceps
e.) biceps

ocean expansion, global warming is melting icebergs and causing water levels to rise.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

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: