Contractors have to spend some time on _____ up the ground to make a ditch.: ответ на тест 1077755 - Английский язык

When contractors need drainage system they make a ______ (long narrow hole dug into the surface of the ground).

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Early men did not have clocks. They told time by the sun and the shadows of trees. At first, they used sticks placed in the ground instead of trees. They made marks on the ground, and the shadows from the sticks told the time of the day.
Later, men began to use sundials. Some sundials were boxes with a stick to cast a shadow. The mark for noon was very important. The sundial always had to face the same way or the time was wrong. Sundials were the first kind of the clock.
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Early men …

All cells arise from other cells through …

In the process of evolution populations are altered over time, hybridize together, or _______ by extinction.

Trees play a significant role in reducing ________ of soil and moderating the climate.

Self-pollination occurs when _______ from one flower pollinates the same flower or other flowers of the same individual.