Although it has a greater than Sirius, Rigel does NOT look as bright in the night sky. a. apparent magnitude c. black hole b. parallax d. absolute magnitude

d. absolute magnitude

Explanation:

Sirius and Rigel are stars present in the sky.

Rigel has a greater absolute magnitude than Sirius. Rigel has an absolute magnitude of -7.4 and Sirius has an absolute magnitude of 1.4. Rigel is much bigger than Sirius.

Rigel is not as bright as Sirius because of its apparent magnitude. Sirius is the brightest star.

jjrnfnf

explanation:

b r

he may like cookies

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.