Plz
a prehistoric clamshell is buried by sediment on the seafloor. over time, the sediment turns to rock, and the clamshell dissolves away. this leaves behind a cavity in the rock that is shaped like the clamshell.
what kind of fossil is this clamshell-shaped cavity?
a.
a mold
b.
a carbonized fossil
c.
a petrified fossil
d.
a cast
the rock and fossil record shows that
a.
both gradual and sudden changes have occurred during earth's history.
b.
all of the changes during earth's history have been slow and gradual.
c.
the earth has not changed very much over the course of its history.
d.
all of the changes during earth's history have been very sudden.

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

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.

well, since there is no answer choices, i will give an answer on how it works : )

the two objects are placed together. energy will always be transferred from the hotter object to the cooler object until they are equal. hope this is close to one of the answer choices : )