Which of the following structures contributes to dna's ability to function as a template for the production of new dna or mrna molecules? a. location of covalent bonds between the nitrogenous base b. orientation of deoxyribose sugar next to phosphate groups c. complementary base pairing between nitrogenous bases (a, t, c, g) d. presence of phosphate groups in the backbone of the molecule

Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Variety of living organisms; includes genetic, species, and ecological types.