Question 7 of 10 Which has not actually been seen by astronomers?
A. Kuiper belt
B. Main asteroid belt
C. Oort cloud
Correct

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

Is this mrna or rna need need the answer in a hurry