Answer:
Explanation: Ecological barriers are natural borders between two ecosystems such as a desert, rivers, or mountains.
1) Producing more offspring at a time
2)Reproducing more often
3)Reproducing earlier in life
Answer:
True
Explanation:
Epinephrine and norepinephrine are the hormones secreted by the adrenal medulla and are also called adrenaline and noradrenaline, respectively. During stress conditions, the hypothalamus stimulates the preganglionic neurons of sympathetic division.
These preganglionic neurons stimulate the chromaffin cells to secrete epinephrine and norepinephrine to prepare the body for fight or flight response. The increased level of epinephrine and norepinephrine hormones in the blood is called “surge of adrenaline”
Answer is Positron Emission Tomography.
Positron emission tomography (PET) is an imaging test based on nuclear medicine. In PET imaging a small amount of liquid radioactive material such as simple sugar (glucose) called fluorodeoxyglucose (FDG) is injected into the bloodstream. It is accumulated in the body and emit gamma rays which are detected by PET. Many diseases such as cancers, brain diseases and heart diseases are diagnosed by the PET imaging.
