the intercourse of a human or animal to make babies
<span>the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
</span>
Go to biology.arizona.edu They have a ton of stuff on blood types. I don’t know if this will help because I’m not in biology yet but I’ve been there and it helped a lot with some stuff. Hopefully that didn’t sound to vague. Have a wonderful day.
I believe it is a solution, sorry if wrong
<span>"D.how living things are interconnected with their environment</span>" is the correct answer. Ecology has to do with systems of environments as a whole, and the organisms that live there.