They got poisned water over the year they didnt take good care of it.
Answer:
A. to remove waste
Explanation:
The purpose of reproduction is to create offspring. Offspring will naturally carry the characteristics of the parents. When offspring are born they create the next generation and keep a species alive. The excretory system removes waste.
In negative control, a gene is switched off when a regulatory protein binds to DNA and shuts down transcription.