Answer:
It has increased
Explanation:
The concentration of carbon dioxide in the atmosphere has increased in the last 200 years. The extra carbon dioxide is causing an enhanced greenhouse effect greater than would happen naturally.
In adults, stem cells remain undifferentiated until they are needed to repair or replace other cells. Stem cells can produce cells that are identical to themselves.
Explanation:
they are native plants in their new ecologies
This is false, <span>deprivation on </span>sleep-dependent<span> motor and declarative </span>memory consolidation have a big affect.
