Answer: An atom is the smallest particle of an element which still retains the properties of the element.
Explanation: An atom is made up of three components: electrons, protons and neutrons. Electrons are negatively charged and are located in the shells where they revolve round the nucleus. Protons and neutrons are found in the nucleus. Protons are positively charged while neutrons have no charge. The negative charges on the electrons balance the positive charges on the protons thereby making an atom neutral.
In the question, it is mentioned that the algae can grow under the conditions of "enough sunlight" and "enough nutrients".
Sunlight reaches the algae, by first falling on the surface made up of ice and snow and then refracting from there into the top layer of the ice where the algae grows.
However, the capability of both snow and ice to reflect sunlight is far more than that of refracting sunlight.
Therefore, the amount of light received by the algae is similar in absence or presence of the layer of snow on the top layer of ice.
However, on deposition of snow on the layer of the ice, the weight of the ice increases and it sinks below into sea water.
This allows more nutrient rich sea water to percolate into the ice and reach the algae.
The algae receive more nutrients from the sea water and hence is capable undergoing better metabolism and growth.
Hence, more algae are produced under such a situation.
Dexamethasone drug in an individual lowers the level of plasma cortisol by lowering the release of Adrenocorticotropic hormone from the anterior lobe of pituitary gland.But in case of people suffering from Cushing syndrome dose of dexamethasone does not lowers the plasma cortisol level.
Explanation:
Dexamethasone is a synthetic Glucocorticoid.As a result it"s functions will be analogous to that of Glucocorticoid.Dexamethasone generally stimulate the rate of Gluconeogenesis thus increasing the production of glucose.As a result the plasma glucose level is elevated.
