Its the Eccentricity of the earth. (shape of Earth's Orbit around the sun, whether it is more circular or ovular.)
Options for the question have not been given. They are as follows:
type of soil
type of plants
exposure to sunlight
method for measuring the growth
Answer:
exposure to sunlight
Explanation:
A scientific experiment has an experimental group and a control group. Control group is included to omit any error in results due to the factors other than the variable factor. Experimental group is the one exposed to different levels of the variable factor.
Here, Carlo wants to determine the the effect of day length on plants' growth. The test variable here is thus the duration of sunlight. In experimental group, this duration will be changed to determine its effect. In control group it will be kept constant so that results from other factors can be excluded from the observed experimental result.
Answer:
Air and noise pollution can occur both indoors and outdoors. They can have natural sources or be released from anthropogenic sources. Scientists have found different ways to reduce the amount of sulfur dioxide released from coal-burning power plants. ... another option is to wash the coal to remove some of the sulfur.
Explanation:
Sulfur Dioxide
A .Structurally support the cell
B.Store nutrients for the cell to consume
C. Produce ATP to provide energy for the cell
D. Selectively allow some materials into the cell
It would be A
The Cell membrane is like a wall it allows things to pass though regulated.
Hope that helps
