Because of the earths curvature, the polar regions receive direct sunlight than the tropical regions .

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

Agenus is a taxonomic grouping that identifies a collection of species. when a scientist discovers a new species, how is this species assigned to a genus