What part of the ice cores tells us what the atmosphere was like in the past? A. The water when the ice cores melt.
B. The ice crystals.
C. The rings of the ice core.
D. The air bubbles trapped in the ice cores.

C

Explanation:

I took the test a few days ago. :)

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.