Question 1 Ozone prevents harmful X-rays from reaching earth.
( True or false )

Question 2
Ozone layers loss is caused by chlorofluorocarbons.
( true or false)

Which statement about dna replication is true? a. eukaryotes only have one circular chromosome that unwinds at multiple locations. b. eukaryotes can only replicate one segment of a chromosome at a time. c. prokaryotes can only replicate their single circular chromosome in the nucleus. d. prokaryotes only have one origin of replication to initiate replication.

The production of cells during mitosis into specialized function is recombination or differentiation

Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere