1.Realice la distribución electrónica y determine la fórmula de Lewis para los siguientes elementos:
- Ca
- L
- Br
- C
- O
- H
- Rb

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

Does masterbation affect height growth or loss of growth hormone?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels