Answer:
i think that it will be :
Explanation:
1-coal
2-hydroelectric power
3-oil
4-nuculear power
*2&3 i amn't sure about them*
The correct answer is D.
A keystone specie refers to a plant or animal which play very important roles in the way a particular ecosystem functions. Without the keystone specie the ecosystem will be totally different or even cease to exist, thus keystone species have strong influence on the ecosystems in which they exist. Most of the time a keystone specie is a dominant predator whose removal allow a prey population to increase dramatically in size and thus reduce the overall diversity in that particular ecosystem.
When there is an increase in hydrogen ion concentration, the soil becomes acidic.
Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.
Answer:
C. Population
Explanation:
Population is defined as the number of organisms of the same species living in a particular area at the same time and are capable of interbreeding.