Which of the following statements are characteristic of dna?
(i) double-stranded helix
(ii) sugar is deoxyribose
(iii) found in the nucleus

How do cells grow and reproduce to maintain homeostasis?

One function of the immune system is to attack the foreign cells to protect the body. in organ translate , the body recongnizes that the new organ is made of foreign cells. wha kind of medicine would you give a patient to increase the chances of transplate success

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled