William wanted to create a report on a geographical location with the greatest species diversity. which ecosystem can consider for his report? the ocean a desert a tropical rain forest a coral reef

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

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

Why has two different alleles for the same trait?