Producers such as plants.
Answer: The correct answer is option B.
Explanation:
Average kinetic energy of the gas molecule is given by relation:

= Avogadro Number
T = Temperature of the gas in Kelvins.
R = Universal gas constant

With increase in temperature the kinetic energy of the gas molecule increases and vice-versa.
So, according to the question the explanation for a drop in temperature of the gas is decrease in average kinetic energy of the gas molecules.
Hence, the correct answer is option B.
Answer:
Ca2+ represents an ion with 20 protons and 18 electrons.
Explanation:
A calcium atom has 20 protons and 20 electrons. The 2+ charge next to the symbol indicates a loss of two electrons: 20-2=18.
Because the density are v/mass not mass only so the one that floats have a density less than 1 and the one that sinks have a density more than 1 {(1) is the water density}
Answer:
The fourth orbital containing 4 electrons.