One type of atom
a pure substance
1) X
2) B. X
3) the inner planets are the "terrestrial" planets. Which are Mercury, Venus, Earth, and Mars.
Answer: The most massive stars, with eight times the mass of the sun or more, will never become white dwarfs. Instead, at the end of their lives, they will explode in a violent supernova, leaving behind a neutron star or black hole. ... Low- to medium-mass stars, such as the sun, will eventually swell up into red giants.
Explanation:
Answer:
Grinnell was the scientist who coined the term niche. An ecological niche the place where the species and their members live together. Niche is quite different from habitat.
Niche include all the things which have impacts on a population and population impact on its environment and other species in their area. So the ecological niche does not mean the volume of area a species occupies but also include its specific functional role in its community.
For example, a lake can be considered as a habitat for fish but a lake can provide a different niche for fishes. A big fish hunting a small fish in a portion of a lake is a niche and a small fish hunting an insect in another portion of the lake is another niche.
True
All flatworms rely on diffusion for respiration, excretion and circulation
