Answer:
B. is not manipulated and used for comparison
Explanation:A control group is merely a group placed on an experiment for comparing with the experimental group. The control group will receive no treatment and serves as a reference to measure the reactions of the subjects present in the group being tested.
The use of a control group is necessary for an experiment since the experiment has variables being tested and some other factor may arise in the carrying out of the experiment, that previously was not taken into account. It allows then to eliminate also non-essential variables.
Then researchers can make sure the hypothesis, remaining all variables the same for the tested groups will enable to measure the independent variable and see if this variable is to be held accountable for the results as the outcome of the research.
North america is the place in which the goldenrod originates from.
The basement membrane is the thin, non-cellular structure of connective tissue that separates the lining of an internal surface and external surface from underlying connective tissue in metazoans.
The epithelium is a type of body tissue that covers all internal and exterior body surfaces, lines hollow organs and body cavities, and makes up most of the glandular tissue. The body comprises four types of tissues; depending on the location, connectives, muscular, nervous, and Epithelial, which perform the function of protection, secretion, and absorption.
Some examples of epithelial tissues in your body are the outer layer of the skin called the epidermis, the sweat glands, respiratory tract lining, intestines lining, etc. you can also read more on Epithelial tissue.
Learn more about Epithelial tissue here:
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Answer:
A
Explanation:
Less pollution means less greenhouse gasses being emitted.
Answer:
See explanation.
Explanation:
The initial days and even weeks of pregnancy may happen without a woman being aware of the pregnancy. Even though the baby grows quickly, it starts out as just a fertilized egg. So it takes a while to be noticed. And there is plenty of room at first.
But with an ectopic pregnancy, the baby attaches, instead of in the uterus, outside of the uterus. In most cases, the baby attaches inside the fallopian tube. Outside of the uterus is not designed to provide support and space for the baby. As growth occurs, it can cause severe problems. This is dangerous and can cause bleeding, pain, and possibly shock of the woman's condition is not identified and treated.
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