Which characteristics describe the troposphere? Select two options.
Is the innermost layer
contains the ozone layer
has the highest air pressure
spans 12-50 km above earth
is a good place for planes to fly

Select the correct answer from each drop-down menu. during the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.

Areal dna molecule consists of thousands of these pairs of nucleotides. what is the pairing arrangement of the nitrogen bases

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca