Answer:
The correct answer is option B, that is, phthalates.
Explanation:
A class of chemicals that are used to soften plastics like PVC, function as fixatives and solvents and bind fragrances in the products are known as phthalates. The human encountering with the chemicals can take place via:
1. Inhalation of fragrances or fumes from fixatives and solvents,
2. Chewing on a plastic toy by a child that develops small openings in the plastic, which provides a space for the chemical to get leached from the toy into the mouth of the child.
3. Through the absorption of perfumes, lotion, and deodorants.
The serious health effects of the chemicals comprise developmental and reproductive issues, hormone disruption, low sperm count, asthma, undescended testes, preterm birth, premature puberty, and development of certain kinds of cancers.
The subunits of Nucleic Acids are called Nucleotides.
The answer would be A, a system because all the others are just again parts of a system.
A. The only difference in the shown diagram is the temperature.
In setup 1, the temperature is 20 degree and in the setup 2, the temperature is 15 degree.
So, the scientists must be studying the effect of temperature in this controlled experiment, where temperature is variable.
The habitat of the lily plant is tropical, which have a mean temperature of 18 degree Celsius. So, the scientist must be studying the effect of low temperature on lily.
The possible hypothesis could be, The lily could survive in slightly lower temperature, if proper amount of light and other nutrients are available.
B. The replication of the experiment is very important to see the validity of the result obtained, it also reduces the variability in result and avoid any preset ideas.