The answer is a. Plants, algae, and certain Protista
Answer: It demonstrated what Early Earth was like long ago, when organisms were basic. They tested what organisms were alive and what they were like.
The answer is; B
Rocks have naturally occurring and spontaneously radioactive atoms in them, such as carbon-14. These element isotopes decay into other types of atoms over millions of years. Therefore, by measuring the amount of these radiometric substances, and knowing the half-life of the isotopes, it is possible to postulate the age of a rock to within certain ranges of error.
Answer: the answer is choice b
Explanation: based on knowledge about food chains, this choice makes the most sense
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Dissolved O2 conc. in flask with algae will be higher since photosynthesis produces O2.
