I believe it is C but not sure.
Answer:
Species could go extinct when their environment changed if they could not adapt to the change.
The DNA is zipped open by the enzyme DNA helicase, to form two singles strands of DNA for that specific area of the DNA.
Then RNA nucleotides are joined to the sense strand to form a complementary strand of RNA, the RNA is small enough to leave the nucleus by the nuclear pores and go to the ribosomes. This process is called transcription
<span>Serotonin and norepinephrine are the types of neurotransmitters that are released.
REM sleep is the rapid eye movement sleep and mostly it occurs after 90 minutes when you sleep and at that time specific brainstem neurons have their activity reduced and you can also have intense dreams in that time period. There are also stages during rapid eye movement sleep.</span>
