Answer:
(3) a single variable
Explanation:
A control experiment can be defined as an experiment in which a condition assumed to be a probable cause of the effect is being compared to the same situation by the scientist without involving or using the suspected condition.
Controlled variable refers to anything or quantity such as group, person, event, etc., that is held constant by the researcher during an experiment and as such is limited.
The first trial of a controlled experiment allows a scientist to isolate and test a single variable.
Generally, most scientific experiments usually have a control group so as to avail scientists (experimentalists) an ability to compare the outcome of their test results before testing a single variable. This control group is not given the treatment or influenced by the same single (independent) variable as the experimental group.
Therefore, this is the reason why science completely or totally rejects any hypothesis which is not supported by observations, as well as the results obtained from control experiments.
This ultimately implies that, for any hypothesis to be acceptable in science, it must be supported by observations and the results of control experiments; this give rise to factual informations, theories and by extension solutions to problems.
The correct option is OSMOSIS THROUGH A SEMI PERMEABLE MEMBRANE.
Osmosis is defined as the process by which molecules of a solvent [water] are transported through a semi permeable membrane from the region of a lower solute concentration to that of higher solute concentration. The membrane is said to be semi permeable because it allows the water molecules to pass through but does not allow the salt molecules to pass.<span />
Epithelial tissue will most likely be found lining organs where substances have to easily diffuse across, such as the intestines and the lungs.
<h3>What are tissues?</h3>
Tissues may be defined as the group of similar cells that combine together to form similar functions. Four main types of tissues are epithelial tissue, connective tissue, muscle tissue and nervous tissue.
Epithelial tissue are presents on the surface, body lining and lining of mouth and internal organs.
The cells of epithelial tissue are one layer thick only. This means epithelial tissue that have the function of absorption are usually thick and has a large surface area that increases the rate of absorption.
Thus, Epithelial tissue is the answer.
To learn more about Epithelial tissue click here:
brainly.com/question/13404204
#SPJ1
Answer:
When the hearts contracts
it pushes blood out of the heart
and it goes to a blood vessel of the
circulatory system.
Explanation:
