What is the truth about dna and rna
a. they consist of single strand of nucleotides

b. they are used to assemble carbohydrates

c. they contain sugars, phosphates, and nitrogen

d. they contain uracil

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen