True.
In the upper layers of the atmosphere, it blocks UV radiation from the sun; however, in the lower layers, it is a pollutant.
Answer:
D. Solar energy is a renewable resource.
Explanation:
Solar power is energy from the sun that is converted into thermal or electrical energy. Solar energy is the cleanest and most abundant renewable energy source available, and the U.S. has some of the richest solar resources in the world.
Answer:
Concentration gradient
Explanation:
Concentration gradient of the ions across the membrane generates the membrane resting potential.
Concentration gradient means that there is unequal distribution of the ions on different sides of membrane. For example, the concentration of K ions is much higher within the cell then out of the cell. Opposite is with the Na ions. When ions move from the area of their higher concentration to the are with the lower concentration, we say they move down the gradient or diffuse (no energy required). On the other hand, movement of ions against their gradient means that this process requires energy and involves protein pumps.
Answer:
The correct answer would be the option B.
The carrying capacity of an ecosystem refer to the maximum number of plants, animals, insects, and crops an ecosystem can support without getting any degradation.
Carrying capacity of different species may vary within an ecosystem.
It is determined by different factors such as food availability, shelter, water supply, et cetera.
