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Wittaler [7]
2 years ago
5

20 POINTS! Why is it important to use a controlled experiment?

Biology
2 answers:
Otrada [13]2 years ago
8 0

B. So you can be certain of the link between the variables
that’s the answer
gregori [183]2 years ago
3 0
Answer is B !!!

you have to know what youre doing
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His third law states that for every action (force) in nature there is an equal and opposite reaction.

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Types of organisms that are photosynthetic primary producers are plants and what else ?
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What are "blank" cells called?
JulijaS [17]
If you are checking a cell for a zero value and the cell is blank, the test evaluates to true. For example, if you have the following formula in cell A1 =IF(B1=0,"zero","blank") and B1 is blank, the formula returns "zero" and not "blank" as expected.

If the range might contain a blank cell, you should use the ISBLANK function to test for a zero value, as in the following example: =IF(ISBLANK(B2),"blank",IF(B2=0,"zero","other")) Note that the above formula returns "zero" if there is a zero value in the cell, "blank" if the cell is blank, and "other" if anything else is in the cell.

You must always use the ISBLANK formula first before you test for a zero value. Otherwise you will always return a "true" for the zero value, and never get to the test for the ISBLANK formula.
7 0
3 years ago
How many species do scientist think are on earth
german

Answer: a lot or. There is over 5 sapiebs

Explanation: They are still looking for then

5 0
3 years ago
Una célula muscular de una especie tiene 20 cromosomas, ¿ cuantos cromosomas crees que tiene una célula nerviosa de la misma esp
irina1246 [14]
46 Cromosomas

Las células del ser humano tienen 23 pares de cromosomas, 22 pares de autosomas y un par de cromosomas sexuales. Por tanto, cada individuo tiene 46 cromosomas en sus células. Por lo tanto, el número de cromosomas presentes en una célula nerviosa de un ser humano es de 46 cromosomas.
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