What are three terms to describe organisms such as cows

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?

Which of the following is true? species on earth today are but a fraction of all species that ever lived. the number of species existing at one time has decreased throughout history. extinctions of past species has happened gradually and on a small scale. most organisms present early in earth's prehistory were more complex than modern organisms. "bacteria represent a newer form of life, not present during the early prehistory of earth."

What is the role of dna helicase during dna replication? a. to unwind the duplex dna b. to attach primers to the replicating strands c. to add bases in the sugar-phosphate backbone