Answer:
Embryonic stem cells could be used to make more specialized tissues that have been lost to disease and injury. For tissues that are constantly replaced, like blood and skin, stem cells would probably be replaced directly.
Explanation:
I think the third statement is correct. RNA consist of ribose sugar while DNA consist deoxyribose sugar. and the nitrogenous base that is different would be the thymine in DNA becomes a uracil in the RNA
An element is also a pure substance. The reason for this is because an element contains only one type of particle.
Option A is correct
The Cretaceous–Paleogene (K–Pg) extinction event (also known as the Cretaceous–Tertiary (K–T) extinction) was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago.
