Answer:
Sand
Explanation:
A well should be placed so that contamination from any source moves away from the well and not toward it.
Echo location is what dolphins use navigate
3. naturally occurring
4. fossilized plants or air bubbles ( probably the plants tho)
5. increased
6. the green house effect occurs naturally, it is being polluted both naturally and unnaturally, the unnatural pollution is contaminating our 'greenhouse" and that is horrible.<span />
Answer: D
Explanation: because the 2 sides on D dont look the same
(pls mark brainlyest)
Lac operon gets activated in the presence of lactose, but Trp operon gets deactivated in the presence of tryptophan.