The dependent variable is plant height.
The <em>dependent variable</em> (plant height) is the <em>property that changes</em> as a result something the scientist does.
The <em>independent variable</em> is the <em>property that the scientist changes</em> systematically (the amount of CO_2) to see its effect.
The <em>number of plants</em> and the <em>types of plants</em> are <em>uncontrolled variables</em>. They may or may not affect the heights of the plants.
The answer is 8.13 x 10²⁸ atoms.
First
we calculate the number of moles using
the molar mass.
molar mass of helium = <span>4 g/mol. </span>
<span>
it means that 1 mole of helium atoms weighs 4 gram.</span>
Now we have 540 kg of helium =540000 grams
Number
of moles in 540000 grams;
540000 / 4 =135000 mol
Now in one mole there is 6.02 x 10²³ atoms
So, in 135000 mol there is;
135000 x 6.02 x 10²³ = 8.13 x 10²⁸atoms
Answer:
Explanation:
Initial pressure, P = 125 kPa
Initial temperature, T = 25.0°C
If new pressure is increased to P' = 150.0 kPa
We need to find new temperature. According to Gay-Lussac's law,
P ∝ T
or
So, the new temperature will be .
D. They're the main site of photosynthesis in autotrophs.