Percent of organisms on earth are considered carbon-based.
a. 20.5%
c. 89.9%
b. 50.9%
d. 99.9%

D. 99.9% is the answer

Explanation:

italy's population growth rate is almost at zero, the national statistics agency, istat, said on monday, mainly due to a dwindling birth rate.

answer; i believe the correct answer is (replication is not conservative);