Explain how the ovum and the sperm cell are suited to the jobs they do.

Explanation:

A.For sperm

1.tail for movement

2.mitochondria for energy

3.enzymes in acrosome for digest and make a path in ovum wall.

B.FOR OVUM

1.Ability to secrete chemical which direct the sperm

2.presence of attachment organs for sperm in their wall

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation: