Answer:
Option a
Explanation:
Random selection or random sampling from a given population is the most appropriate way, especially in experimental studies. This method is simple and accurate. According to the above-mentioned case, if the researcher selects students randomly for the experimental and control group, then each of them would have an equal chance of selection. Hence, the results would be generalized and not biased.
Answer:
b
Explanation:
cause enzymes to speed up the reaction.
Trace elements such as iron, iodine, fluoride, copper, zinc, and molybdenum (and much more) are very important for maintaining health. We only need very small amounts. They are also reffered as microminerals, these elements are part of enzymes, hormones and cells that we need in the body. Without these small amounts of trace elements, our body starts to show symptoms of nutrition deficiency.
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Answer:
D fleas affect all animals
When a plant is using transpiration to cool off during the day, its stomates are __*open*__ and its water potential is __*higher*__ that of the soil. At night, the plant's water potential will be __*lower*__ that of the soil.
*__* are the answers
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