These are cold-blooded vertebrates that live in fresh or salt water, have streamlined bodies and gills for breathing.
mammals
fish
reptiles

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!

i believe your answer would be c.. : )

condenser is used to focus in the light microscope.

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.