Neurogenesis
As recently as two decades ago, scientists believed we were born with all the neurons we would ever have. But the discovery of neurogenesis occurring in certain brain areas in monkeys gave rise to the hope that someday scientists will be able to induce the adult human brain to heal itself.
Neurogenesis is the process by which new neurons are created and developed in the brain. The new neurons are created by neural stem cells and it happens in almost all species of animals. Neurogenesis is effectual during embryonic development and completely through adult life in different organisms.
Answer:
I believe it may be "B" so hopefully it's right
The 2nd and 4th answer choices sound the best to me. I personally would go for the 2nd one, explaining that the fossils of fish K and fish R and Y are similar. If you get the question wrong, I am VERY sorry. :(
DNA together with RNA are the most important molecules in biology. It is the hereditary material in humans and almost all other organisms in our planet. Most DNA is found in the nucleus and some or small portion can be found in the mitochondria.
The main features of the three-dimentional structure of DNA are:
DNA is double-stranded composing of two polynucleotide strands alongside each other which are wound round each other to form a double helix. The two strands are joined together by hydrogen bonds between the bases and these bases form base pairs which is like a rung of a ladder. The base pairs are specific. Base pair A only binds to T (T with A), and C only binds to G (G with C). These are called complementary base pairs. As a wholes, DNA molecules control the production of proteins which characterize each type of organism.
