What happens when the lungs recoil? end of exam
a. inspiration occurs.
b. the rib cage moves up.
c. expiration occurs.
d. ribs and diaphragm muscles contract

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides. b) replication of their genomes does not involve proofreading. c) rna viruses can incorporate a variety of nonstandard bases. d) rna viruses are more sensitive to mutagens.

Which practice is harmful to the land? a. using animal waste as fertilizer b. composting with peels from commercial fruit c. throwing paint cans in the garbage d. cutting the lawn with a gas-powered mower

Which field of study contributes ideas and concepts to biomechanics?