How does andrew knoll's idea that "prokaryotic metabolisms form the fundamental ecological circuitry of life; bacteria, not mammals, underpin the efficient and long-term functioning of the biosphere" relate to the nitrogen cycle?

What was the land like over 500 million years ago? what was under the sea?

Many farmers prefer cattle without horns because it is safer for their herds. the allele for no horns (n) is dominant to the allele for the presence of horns (n). a farmer mates a male with horns to a heterozygous female without horns. what is the chance that the offspring will have horns?

Ture or false evidence for evolution includes millions of fossils