15. Where do most scientists today predict that the earliest cells lived? a) Deep in isolated salt lakes
b) Around hydrothermal vents
c) Places where lightning strikes are most common
d) Mars, or perhaps a comet

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Ture or false evidence for evolution includes millions of fossils