Geologic columns are models that are used to organize and study Earth’s geologic history and fossil record. How do they relate to the principle of uniformitarianism?How does knowledge of sedimentary rock formation help us to understand fossils?

Agroup of plant cells was exposed to radiation, which damaged the chloroplasts and caused them to lose function. if the mitochondria were unharmed, what would happen to the overall function of the plant cells? a. the cells would not be able to make food, but would be able to release energy from biomolecules. b. the cells would not be able to replicate dna, but would be able to break down waste. c. the cells would not be able to break down waste, but would be able to replicate dna. d. the cells would not be able to release energy from biomolecules, but would be able to make food.

What materials must dams have to produce electricity, and what must occur?

Some substances but not other can cross the (blank) membrane of a cell