Contamination is the answer you are looking for.
Answer:70% of todays air pollution comes from gas powered vehicles so the answer is d
Explanation:
The Developing ovarian follicles primarily secrete hormone Estrogen.
Ovarian follicles are the basic units of female reproductive system. Estrogen, in females, are produced primarily by the ovaries, and during pregnancy, the placenta. Follicle-stimulating hormone stimulates the ovarian production of estrogens by the granulosa cells of the ovarian follicles and corpura lutea.
2.5g/ml will sink because it has higher density compared to water
0.5g/ml will float because it has lower density compared to water