The right answer is B
A radiotracer is an entity composed of a carrier molecule and a detectable radioactive isotope using devices such as gamma cameras or positron emission tomography.
A radiotracer is either a radioactive isotope alone or the combination of a molecule and a radioactive isotope. In this case, it is said that the molecule is labeled by the radioactive isotope.
A radioactive isotope is an atom whose nucleus, unstable, emits radiation. It could be :
- alpha radiation consisting of two protons and two neutrons.
- a beta radiation consisting of a negative electron (beta) or a positive electron (beta +, positron).
- a gamma radiation consisting of a high energy photon.
Skin remains red after a bad sun burn because:
inflammation causes increased blood flow.
Explanation:
When our skin is exposed to sun rays , the epidermal layer starts getting damaged. The damage to the cell caused by sun rays triggers the melanin secretion. Increased secretion of melanin results in darkening of the exposed region .
However, the damage and inflammation to the skin increases blood flow to the skin, this causes reddening of the skin.
Well,During Photosynthesis Sunlight Converted into chemical energy Water Combines with carbon dioxide to form glucose Chlorophyll Combines with water to form oxygen.
All the members of a specific species that live in an area are a population.
