Which of the following statements belongs in the box labeled “a” on the chart above? a. protects the ecosystem of the nile river delta b. controls the floodwaters of the nile river c. decreases the amount of arable land d. prevented the relocation of thousands of families

B. Controls the floodwaters of the Nile River

B so that it doesnt flood and it can measure water.

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because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.