The diaphragm muscle sits below the lungs and continuously expands and contracts. What happens in the chest cavity as a result of this expansion and contraction? O The body fills with carbon dioxide.
O A change in air pressure occurs.
O The alveoli fill with oxygen.

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Nucleic acid certain protein cell membranes certain carbohydrates

16. which of the following accurately describes a step within transcription? a. dna polymerase uses one strand of rna as a template to put together nucleotides. b. the dna strand is used as a template for which a complementary rna strand can be produced. c. the rna strand forms a template by which dna can be built. d. the rna strand is produced within the cytoplasm.