1. Use the following setup to answer the questions below: Problem: Do nutrients have an effect on the rate of plant growth?
All plants used were the same height
Two groups:
Group A - given 30 mL of distilled water for 7 days
• Group B - given 30 mL of water containing .1 gram of fertilizer for 7 days
a. State a possible hypothesis:
b. What are two factors that must be kept the same (constant) between both groups?
c. What is the independent variable?
d. What is the dependent variable?
le. Which is the experimental group?

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.