A. Species adapt over time based on the environmental selection pressures. Individuals cannot go through evolution, since evolution consists of natural selection, which chooses for individuals with certain advantageous characteristics to survive, and for the individuals with disadvantageous characteristics to die. The favourable allele coding for the advantageous characteristic in individuals will then be passed on to their offspring, and natural selection continues.
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Much like earth, the gravity of itself keeps in place from the core. but sometimes there are sun explosions
D, contains fluid that becomes more concentrated as it moves down into the medulla