The correct answer is pretest and posttest .
A pretest/posttest experiment is an experiment that includes double measurements at multiple points in time. In this kind of test, measurements (measurement of dependent variable) are taken both before and after a treatment.
D. The daily release of hot water into the pond from a local factory.
Explanation:
The daily release of hot water into the pond from a local factory would most likely affect the health of fish in a local pond.
Fishes are cold blooded animals. They derive their temperature from the water around them. They need a fairly stable daily temperature.
If the temperature of the water varies to a large extent too much daily, they will suffer.
Hot water will affect the fish population badly. It will cause the fishes to die off and suffer from too much increase in temperature.
Other factors listed in the options will improve the fish life.
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Klay does not have to worry about anything blowing up or inhailing harmful gases.
The correct option is B.
Carrot can be described as a ground tissues because it is formed inside the ground in form of tap root. The remaining options are incorrect for the following reasons:
1. Animals can not make their own food because they do not have chloroplast not because they do not have vacuoles.
2. The main function of dermal tissue is protection from water loss not photosynthesis.
3. The cerebellum controls balance and coordination not cerebrum.
