Carbon dioxide levels are currently at in our global atmosphere.
325ppm
425ppm
315ppm
375ppm

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt