Which statement is true?
a. spiral and elliptical galaxies have gas and dust between stars while irregular galaxies do not.
b. spiral and irregular galaxies have gas and dust between stars while elliptical galaxies do not.
c. irregular galaxies have gas and dust between stars while elliptical and spiral galaxies do not.
d. elliptical galaxies have gas and dust between stars while irregular and spiral galaxies do not.

Look at this image of a galaxy.

Dust, gas, and stars in the shape of a pinwheel.

What type of galaxy is shown?

barred

elliptical

irregular

spiral

Explanation:

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.