The contractile vacuole expels excess fluid from the cell.
D.
They have the same number of protons as electrons.
Explanation:
Protons are found in the nucleus of the atom and have a positive charge while electrons orbit around the nucleus and have a negative charge. Usually, in a neutral atom of an element, the number of protons is equal to the number of electrons. This is why the atom has no charge because the positive and negative charges cancel out. When an atom loses an electron its charge turns positive while when it gains an electron its charge turns negative.
Answer:
<h2>A. Chromosome</h2>
Explanation:
In intermediate phase of cell cycle, DNA replication occurs (in S-phase), so in inter phase, DNA become unfolded and in relaxed state and is available for replicating machinery.
When cell enter into prophase, DNA folds, coils and super coils and finally become in condensed form, which can be seen by microscope.
So this compact form of DNA is called as chromosome.
In humans. there are total 46 chromosomes.
Given what we know, we should observe the objects falling at the same speed in both the tower and vacuum scenarios, but not in the water.
<h3>What affects the speeds at which these objects fall?</h3>
- The falling speeds in both air and a vacuum will be the same for both objects.
- This is because falling speed is determined by gravity and is independent of the mass of the objects falling.
- The same will occur in water if and only if the densities of the two objects are equal.
Therefore, given that we can safely assume that the densities of the two objects are different from one another, we can confirm that while the objects will fall at the same speed in air and in a vacuum, this will not be the case in the deep pool.
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