Among the characteristics unique to animals is
a. gastrulation c. sexual reproduction
b. multicellularity. d. flagellated sperm

a.gastrulation is the correct answer.

Explanation:

The characteristics unique to animals is gastrulation

Gastrulation is a stage early in the embryonic growth in most of the animals, through which simple layered blastula is rearranged into a multi-layered structure called gastrula.

gastrulation results in the formation of three germ layers

The embryonic tissue layers are developed and arranged in their proper places during the gastrulation process.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.