What is true about the relationship of dna and genes?

a. each gene contains a segment of a dna molecule
b. segments of genes contain the code to make dna
c. segments of dna contain the code to make a gene
d. each dna molecule makes up a segment of a gene

i need asap

and

what determines the similarities in anatomical features among organisms

a. predator prey relationships
b. chromosomes and genes
c. location on earth
d. environmental conditions

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.