Mr. Parker 31. Which of the statements below gives
the best definition of gas exchange?
a. Swapping oxygen for digested
food in the gut capillaries
b. Using energy to breathe
c. Exchanging inhaled air for
exhaled air in the lungs
d. Exchanging oxygen for carbon
dioxide in the lung alveoli

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

Explain the significance of the increased cell specialization of the volvocine line

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.