Why is pH level important in soil?
What will be an ideal response?
The pH level has to do with the acidity level in the soil. It is important because some plants will not grow well in soils with too high or too low an acid level.
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Explain the phenomenon of the photoelectric effect.
What will be an ideal response?
Nitrogen taken up by plants growing in a compost-treated soil is indistinguishable from the nitrogen taken up by plants growing in a fertilizer-treated soil
Indicate whether the statement is true or false
A black box with a circuit in it is connected to a variable resistor. An ideal ammeter (with zero resistance) and an ideal voltmeter (with infinite resistance) are used to measure current and voltage as shown in Fig. 4.143. The results are shown in the table below.
 FIGURE 1.png)
Which of the following is a feature of mammals?
A. 4-chambered heart B. warm-blooded C. young are born alive D. all answers are correct