B ecosystem. They include abiotic factors and biotic factors.
Explanation:
For question no 19
Force (F) = 20N
distance (d) = 5m
Work = F * d
= 20 * 5
= 100 J
Now
For question no 20
D. No matter how much force is applied the object must have motion for work to be done.
Answer:
The best explanation for a partial solar eclipse is that moon only partially covers the sun during the eclipse (option D).
Explanation:
A solar eclipse occurs when the<u> moon stands between the sun and the earth</u>, which happens when the moon is near the plane of the ecliptic, that is, the point where the orbits of the earth and the sun intersect.
A partial solar eclipse occurs when the moon partially covers the sun, which depends on the observer's point of view on the earth and his geographical location.
The other options are not correct because:
<em> A. If the earth stands between the sun and the moon, </em><em><u>lunar eclipses </u></em><em>occur.
</em>
<em> B and C. During a solar eclipse it is not possible to see</em><em><u> lunar phases</u></em><em>, which occur when the sun's rays are reflected off the satellite.</em>
Following what ?..
where is the choices
Well that would be the moss in the pond