<span>the spiral arms of the milky way was made of: D. younger stars and gaseous nebulae
The spiral arms of the mily way was organized into four spiral arms, and since it was made of younger stars and gaseous nebulae, Spiral arms typically contain a higher density of interstellar gas and dust than the Galactic average as well as a greater concentration of star formation</span>
Answer:
there were several important cities that came into being as centers of trade and religion, such as Mecca, Medina (Yathrib), Karbala, and Damascus.
Explanation:
The correct answer is D. The heat from the sun allowed only rocky planets to form in the inner part of the solar system.
Explanation
The inner solar system is the name of the region that includes the inner planets that are characterized by being terrestrial in type, have dense and rocky compositions, few or no moons, and there are no ring systems. Another of its characteristics is that Venus, Earth, and Mars have enough atmosphere to generate climate. On the other hand, the region of the outer planets includes the four most distant planets from the sun, located beyond the asteroid belt, that is, Jupiter, Saturn, Uranus, and Neptune that are characterized by rotating at high speed, have gaseous surfaces, and rings around them (the most notable example is Saturn).
Answer:
The statement that they are characterized by rapids and waterfalls is incorrect about floodplains.
Explanation:
All other points mentioned holds for flood plains:
- Most of the floodplains are low lying areas
- They are generally, the land areas which are adjacent to streams and rivers
- They are subjected to repeated influx or flooding.
- They can be simply characterized by a relatively smooth land area on whose boundary lies water stream or river which overflows or results in flooding at the time when water is high.
The answer is to fill different niches.
<span>Adaptive radiation is the process of development of new forms
of organisms from an ancestral species. <u>When an environment changes or some new
niches open, speciation from the ancestral species occurs. </u>New species have morphological and
physiological adaptations which allow them to exploit a whole range of
divergent environment.</span>
