Answer: a cell membrane
Explanation: But remember that bacteria do have their DNA inside their protein envelope. They don’t have a nucleus, but they do have DNA making them also have the ability to reproduce.
The answer is D 2 long and 2 short
I believe the answer is A) photosynthesis and respiration
Answer:
yes
Explanation:
as the atrium contracts , blood flows from your right atrium into your right ventricle through the open tricuspid valve. when the ventricle is full, the tricuspid valve shust . this prevents blood from flowing backward into the right atrium while the ventricle contracts