7. According to the fossil record, which group of organisms has existed for the greatest length of time? (1) gastropods (3) mamm
1 answer:
You might be interested in
Answer:
What is carbon hydro
<h3><u>A hydrocarbon is a molecule whose structure includes only hydrogen and carbon atoms</u></h3>
Explanation:
<h3> <u><em>The carbon atoms join together to form the framework of the compound, and the hydrogen atoms attach to them in many different configurations.</em></u></h3><h3><u><em /></u></h3><h3><u><em /></u>