Plz?

15. suggests that our solar system evolved from a huge rotating cloud of dust and gas.

16. lines used to measure distances east or west of the prime meridian in degrees.

17. the major difference between a topographic map and other maps is that a topographic map shows

1. The right answer is The nebular hypothesis.

Scientists agree that our solar system results from the contraction, under the effect of its own mass, of a cold and dense interstellar molecular cloud made of gas, hydrogen, and helium essentially, and grains dust covered with ice water. Very quickly, a disc of matter would have formed, turning on itself, slowly on the periphery, quickly in the center. There, at the heart of the disc, the matter being more and more compressed by the movement and the increasing temperature, nuclear fusion reactions would eventually have started. This heart would have started to shine by releasing a phenomenal energy, giving birth to our star, the Sun, 4.56 billion years ago. The rest of the cloud would have continued to gravitate around this very young star, the most volatile compounds being rejected at the periphery under the effect of the very high temperature.

In this primordial nebula, the dust would have progressively agglomerated, forming grains that would have gathered together step by step in boulders, which by aggregating would have gradually given birth to the 9 planets of the solar system, their satellites, and meteorites.

2. The right answer is lines of longitude.

Longitude is a geographical coordinate represented by an angular value, an expression of the east-west position of a point on Earth (or on another sphere). The reference longitude on Earth is the Greenwich meridian.

3. The right answer is topographic map shows elevation.

A topographic map is a reduced-scale map representing the relief determined by altimetry and the human features of a geographical area in a precise and detailed manner on a horizontal plane.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.