what is one situation in which population density could have a negative impact in the production of offspring?

they dont have any evidence

a compound light microscope is used to magnify objects in steps.  

hope it

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.