In the mantle, ___ transfers heat energy to guide the rock cycle. A. Radiation
B. Convection
C. A convection oven
D. An ocean current

when it is at an intermediate population density

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"

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.