I think it’s B I’m not sure
The valves are responsible for preventing blood from flowing in the wrong direction, they are present in the veins, and the arteries don't need them because the aorta (biggest artery) pumps or in other words pushes it with such a force that no other force can change its direction, in the veins there is no structure present for pumping them as a result we have got valves so that they go in one direction...... the meaning of the word valve is to allow in one direction
Answer:
An organism with five pairs of chromosomes can have 32 genetic possibilities from a variety independent of its single gamete.
Answer:
cells are the smallest unit of life
Explanation:
Answer: Transcription
Explanation:
Transcription is the process by which DNA is copied (transcribed) to mRNA, which carries the information needed for protein synthesis. ... The pre-messenger RNA is then "edited" to produce the desired mRNA molecule in a process called RNA splicing.
