A meteor crashed into earth carrying a strange alien gass. The gas wasn't poisonous, but it did remove all the cholorplasts from EVERY plant cell on earth. (How would earth be different?)

(How would this change life for humans?)

the answer is c a tornado

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.