1. Most of the coal used in power plants today was produced Group...

1. Most of the coal used in power plants today was produced

Group of answer choices

during the time of differentiation

 

in the epoch of heavy asteroid bombardment 3.5 billion years ago

 

by dead plants about 360 million years ago

 

at the time of the extinction of the dinosaurs about 65 million years ago

 

2. Modern humans, or Homo sapiens, are

Group of answer choices

unrelated to monkeys or apes in the phylogenetic tree of life.

 

recent arrivals, only appearing in the last 20,000 years.

 

the last surviving species of Hominids

 

one of the 4 remaining species of Homonids.

 

3. Photosynthesis started releasing oxygen about 2.7 billion years ago, but atmospheric buildup of oxygen started at least about 350 million years later. Why?

Group of answer choices

The oxygen was used by burning forests

 

The oxygen was used in oxidation of minerals

 

The oxygen was not released until about 2Gya

 

The oxygen was used in breathing by animals