During exhalation the diaphragm
a. expands and moves up while the rib cage moves out and down.
b. and the rib cage return to their normal resting positions
c. contracts and moves down while the rib cage moves down and in.
d. contracts and moves down while the rib cage moves out and down.

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:

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation: