Electromagnetic waves
Explanation:
Electromagnetic waves are transverse waves that are known to carry and transfer energy from one place to another.
Waves are defined as disturbances that transmits energy. There are two types of waves;
- longitudinal waves are propagated parallel to their source
- transverse waves are perpendicular to their own source
Electromagnetic waves causes the transverse vibration of electrical and magnetic fields.
Mechanical waves like sound generally do not carry matter but transmits energy e.g sound.
Electromagnetic waves do not require materials to propagate. They simple carry and transmit energy themselves.
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Both food chains and food webs contain plants and animals so it is not A.
Food chains separate by trophic level not food webs so it is not B
***Food chains show energy flow by each trophic level and food webs do not therefore it is C***
Answer:
Number of cells killed at the end of the experiment
Explanation:
<em>In research, the dependent variable is one whose value is dependent on another variable - a variable that is supplied by the researcher during the course of the experiment which is also known as the independent variable</em>.
In this case, since the main objective of the research was to determine the most effective antibiotic against the E. coli, the variable that is supplied by the researcher (the independent variable) is, therefore, the different antibiotics while the variable whose value varies based on which of the antibiotics is introduced is the number of dead bacterial cells.
Therefore, the dependent variable is the<u> number of cells killed by each antibiotic.</u>
Answer:
C
Explanation:
A toboggan is a simple sled traditionally used by children. It is well adapted to sliding down open slopes, where its large surface rides easily on loose, fluffy snow.
It was<span> an increase in nativist feelings in the nation.</span>