With increasing elevation on a slope of a mountain, changes in biological communities are somewhat analogous to changes
A) In biomes at different latitudes
B) In communities during different seasons
C) In communities and biomes through the natural history
D) In communities of ocean at different depths​

d. cellulose and starch

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.