Answer:
-19.
Step-by-step explanation:
-19+31 gets you 12.
Answer:
Natural selection is a mechanism, or cause, of evolution. Adaptations are physical or behavioral traits that make an organism better suited to its environment. Heritable variation comes from random mutations. Random mutations are the initial cause of new heritable traits.
48% is very close to 50%, which is known as one-half of something. One half of 200 is 100, so 48% is about 100 (actual is 96).
