Answer:
a domain of single-celled microorganisms
Explanation:
B: nucleus, mitochondria, cell membrane
c and d both have chloroplasts which are unique to plant cells
a is wrong because only plant cells have cell walls
Isotopes are atoms of the same element with the same number of protons and different number of neutrons.
<h3>What are isotopes?</h3>
Isotopes are any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.
As a result of this, atoms of isotopes will have the same atomic number but a different mass number.
Examples of isotopes are
- Carbon-12 and Carbon-14
- Nitrogen-14 and Nitrogen-15
Therefore, isotopes are atoms of the same element with the same number of protons and different number of neutrons.
Learn more about isotopes at: brainly.com/question/11680817
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Cellulose is a major component of tough cell walls that surround plant cells, and it's what makes plant stems, leaves, and branches so strong.