Why are ostia important to sponges? a) They are the pores through which water, sperm, and food enter the sponge.
b) are large openings in the sponge that allow the waste to exit.
c) They are what the gel is composed of that connects all the different cells of the sponge together.
d) They pull water into the sponge through the beating of their flagella.

I'm so confused! If someone could help, it would mean a lot. Thank you and PLEASE no links!

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.

i got you i did it ya know what it is just needing to fill this in for a quick task!