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The answer to this is: C) a factor that may affect an experiment or investigation. This is the best answer. A and B can be eliminated. D describes a controlled variable which is more specific than a scientific variable, thus C is the best answer. It is the best description of just a scientific variable. And, The second one is B: Robert Hooke was a famous scientist who experimented with springs (metal coils). He found that the farther you stretched the spring, the larger the force with which the spring pulled back on you.
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Plants can make their own food by photosynthesising however, animals need to consume plants for energy/as food if their were no plants animals would starve. plants also provideanimals with oxygen as a waste product of photosynthesis which animals need to survive
Answer: The placenta is an organ that develops in your uterus during pregnancy. This structure provides oxygen and nutrients to your growing baby and removes waste products from your baby's blood. The placenta attaches to the wall of your uterus, and your baby's umbilical cord arises from it.
Explanation:
Ans.
Plant waxes include complex compounds of alcohols, carbohydrates, acids, esters, hydrocarbons, and their combinations, present at the outside of epidermal cells. These waxes are strongly hydrophobic in nature and act as water repellents.
Thus, they provide protection to the aquatic plants against surface wetting. In land plants, waxes, present in cuticle prevent water loss, such as in dessert plants. Other functions of waxes include energy-storage, self-cleaning and reflection of UV radiation.
Answer:
A. Global warming is the cause
Explanation:
Our climate is getting warmer due to production of heat wave because the heat wave has high temperature which increases the temperature of the surrounding environment. Researchers found that as global temperatures increase, heat waves will become more frequent and the time between them will become shorter and we know that global temperature increase due to global warming so we can say that global warming is the cause of more heat wave.
