D. It expands and contrasts
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Answer is C hope it helps
The mass number is the sum of the number of protons and number of neutrons the atom has.
So, we can write the equation as:
x + 20 = 40
x = 20 neutrons.
Answer:
b.Their cell walls have very different biochemical properties.
Explanation:
Cellulose is a homopolysaccharide of glucose residues and is the main chemical component of the cell walls of the plant cells. The glucose residues in cellulose are linked together by beta 1-4 glycosidic bonds. Chitin is a linear homopolysaccharide of glucose residues and is the main structural component of the fungal cell wall. On the other hand, peptidoglycan is the major structural component of the bacterial cell walls. Peptidoglycan is a heteropolysaccharide of two different residues. These are N-acetylglucosamine and N-acetylmuramic acid. Therefore, the chemical components and that make the cell walls in plants, fungi and bacteria differ significantly from each other imparting them distinct chemical features.
The training that Michael need to work as a veterinarian in a zoo is to acquire a degree in veterinary medicine.
<h3>Who is a veterinarian?</h3>
A veterinarian is a professional that has passed through a training institution for the purpose of being trained in the area of animal health.
There are different fields in veterinary medicine which Include the following:
- Companion Animal Veterinarians.
- Veterinary Practitioners.
- Food Animal Veterinarians.
- Food Safety and Inspection Veterinarians.
Learn more about veterinary here:
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