Please help!! i need an answer for plato and the answer choices are only A B C and D

Which sequence correctly shows the path of carbon dioxide during repiration?

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

What are the pros and cons of quadrat sampling?