The variables are the factors, which do not have a fixed value. Their value keeps changing in an experiment. It can be divided in two types: dependent variable and independent variable.
The dependent variable in the experiment is the variable, whose tendency to vary depend on other factors. To test this hypothesis, the rate of photosynthesis with respect to different wavelengths. So, the dependent variable is rate of photosynthesis, as it is dependent on the wavelength of the light.
Answer:
The death rate is higher than the birth rate. The birth rate is higher than the death rate.
Explanation:
Answer:
B)
Explanation:
Vaccinations build the body's ability to fight illnesses by introducing a de-activated virus to the body, which then produces antibodies that can kill the virus. The immune system can then "remember" the viruses' structure for future encounters.
The most appropriate justification for the roots of the aquatic plant hydrilla to be poorly developed and lack xylem tissue is to reduce the intake of water to the plant. Therefor the best answer choice is…
C) As hydrilla is aquatic in nature, the roots do not have to search for water, and there is no need for xylem to absorb water because the plant is surrounded by water.
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Answer:
the answer is C
Explanation: