What is the purpose of the spliceosome?

a.
to remove introns from pre-mrna
b.
to join together 2 exons
c.
to transcribe mrna
d.
a and b only are true
e.
a, b, and c are all true

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.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%