Answer:
A. Coal
Explanation:
Coal has the potential to generate energy
The mass number is the sum of the number of protons and number of neutrons the atom has.
So, we can write the equation as:
x + 20 = 40
x = 20 neutrons.
Answer:
Archaeplastida
Explanation:
Archaeplastida is a supergroup that includes Rhodophyta, Chlorophyta and Viridaeplanta. Rhodophyta includes red algae, Chlorophyta includes green algae while Viridaeplanta includes all the land plants. All of these are the autotrophic organisms and have chlorophyll pigments to perform photosynthesis. Chlorophyll a and b are common to all the members of Archaeplastida which in turn gives green color to the green algae and to the leaves of land plants. Phycoerythrin pigment, in addition to chlorophyll pigments, imparts a red color to red algae.
Explanation:
The basic difference between Ecosystem and Community is that Ecosystem consists of various communities which include living as well as non–living components interacting with each other, whereas interaction of different individuals of populations of different species living in a particular geographical area is called Community. The community consists of only biotic factors only.