. Sperm and egg need the normal number of chromosomes. 2. Sperm and egg combine in to produce a zygote with the normal number of chromosomes.

3. Sperm and egg are sex cells called .

4. Sperm and egg are cells because the number of chromosomes has been reduced by half.

5. The process of produces the gametes - sperm and egg.

6. The process of meiosis involves cell divisions and produces daughter cells.

7. Meiosis allows for differences in offspring as a result of sexual reproduction. This is called genetic .

8. occurs when pieces of homologous chromosomes switch places during meiosis.

9. Each gamete produced by an individual is different because homologous chromosomes line up differently each time they're produced. This is called independent .

10. After fertilization, a zygote divides by to produce a multicellular organism.

d. making up measurements to record.

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estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.