Identify the theme or themes exemplified by (a) the sharp spines of a porcupine, (b) the cloning of a plant form a single cell, and (c) a hummingbird using sugar to power its flight.

b ti isnfornopgnoernfrof

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

they kick it to the curb.

explanation:

that current was nasty.