Olivia was reading about the Earth's history. She grew interested in the Quaternary period in the Cenozoic era and studied it further. The Quaternary period is best known for which two major events?
A. the rise of reptiles and flowering plants
O
B. the rise of mammals and swimming mammals
O
c. the ice ages and the rise of humans
O
D. the rise of dinosaurs and other reptiles

oh yeah daddy

mink ,

Explanation:

B

Explanation:

The Cenozoic era was known to be called the age of mammals, because the largest land animals have been mammals during that time. Meaning Mammals that swim would also be living during that time with land mammals.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

d. planting trees

the trees take in carbon to make oxygen.