Подчеркните в предложении придаточные предложения условия. 1. if runoff could be perfectly controlled throughout the river drainage basins, there would have been no flood problem. 2. had they met with such difficulties before, would have known what to do now. 3. if there had been oxygen in the atmosphere when life began, the sun's rays would not have prevented life from developing on land.

Mayflies (also know as shadflies in Canada) are aquatic insects belonging to the order Ephemeroptera. You can mostly see them in May (thats why the are called Mayflies). This order is a part of an ancient group of insects called Palaeoptera, which also contains dragonflies and damselflies. Over 3,000 species of mayflies are know worldwide, grouped into over 400 genera in 42 families. Mayflies are relatively primitive insects and exhibit a number of ancestral traits. Mayflies hatch (emerge as adults) from spring to autumn, not necessarily in May.

Dear Sir,
In our city there is a plan to launch local projects for animals. I write to you because I want to explain why I am opposed to this project.
At first, I think that instead of passing a few kilometers a day to find a food, play, hunt, play and communicate with neighbors, they must miss their close empty cells because
On the need for animals to rest almost do not pay attention. Secondly, animals often suffer from the fact that over them harmless experiments performed. Next, this leads to a strong overload of the nervous system of animals. I hope you pay attention to my opinion. Many people share it.
With sincere respect, Кирилл.