The answer is; A
The operator site is usually associated with the promoter region of the operon. This region is bound by a repressor. The repressor acts as a physical barrier so the RNA polymerase does not bind to its promoter, or even if it binds, does not proceed to transcribe the genes.
Answer:
23.oxygen diffuses through alveoli walls to the blood capillaries
24.blood capillaries surround alveoli
25. pumps blood which carry all the body minerals all over the body from the lungs and to all body parts
The connecting piece of a sperm is packed with gonads that produce energy.
Sperm is the male reproductive cell and is derived from the Greek word "Sperma" Significance is Root.
Sperm cannot divide and have limited life span, but after fusion with egg cells through fertilization, a substitute orgasm begins developing, starting as a totipotent zygote
The digestive organ is the stomach
Though they are an exception, the Inuit traditionally ate a very high fat diet from coldwater mammals like walrus and obtained omega - 3 fatty acids from it and fish oil and had a very low incidence of cardiovascular disease. It has been determined that they have a genetic disposition to be able to survive if not thrive on this diet. Modern man, on the other hand normally cannot survive on a high fat diet as it will most likely lead to heart disease due to increased cholesterol. Interestingly enough though is Dr Atkins diet which is a low carb relatively high fat diet.