Nuclear power plants provide a stable base load of energy
Answer:
Because only a few bacterias can "fix" the atmosphere nitrogen.
Explanation:
The nitrogen at the atmosphere is in the form of N₂ and represents 78% of the atmosphere composition. The element is part of the constitution of nucleic acids and proteins, so the living beings needed them.
However, the animals and the plants can't catch the N₂. Some bacterias that live in mutualism with plants have this ability, and they "fix" the atmosphere nitrogen, transforming the N₂ in the ions nitrite (NO₃⁻) or ammonia (NH₃), which can be caught by the plants.
Them, when the primary consumers eat the plants they catch the nitrogen, which will be passed through the food chain.
So, it's difficult to pull nitrogen from the atmosphere into the nitrogen cycle of the biosphere because only a few bacterias can do it.
Calcium Flouride. It's an ionic bond. Cation + anion with the suffix -ide
Explanation:
The density of a substance is given by :~ ρ = m/v
where:
ρ is the density
m is the mass
V is the volume
as the given values for the variables {mass, volume} are in the same system (CGS) unit conversation is not required :
by replacing in formula : p = 10(gm)/5cm^3
=> 2gm/cm^3