Answer:
A. A and B
Explanation:
The reactants in this reaction is A and B;
Reaction:
A + B → C + D
In a chemical reaction, the left hand side is made up of the reactants.
On the right hand side, we have the products
For the example given;
A and B are the reactants
C and D are the products
The isotope notation : 
<h3>
Further explanation
</h3>
Given
53 protons and 20 neutron
Required
The isotope notation
Solution
Isotopes are elements that have the same atomic number with a different mass number
The following element notation,
X = symbol of element
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
So the mass number of element = 5 + 6 11
Atomic number = 5
The symbol :
The lack of a spinal column is the distinguishing characteristic of invertebrates.
<h3>What is an Invertebrate?</h3>
These are organisms which lack a backbone(vertebral column) while vertebrates on the other hand have it.
This is why option C was chosen as the most appropriate choice in this scenario.
Read more about Invertebrate here brainly.com/question/21332744
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Assuming the conditions of the reaction are maintained and appropriate for the reaction to still occur, the reaction rate can be affected by increasing the concentration of the reagents used in a reaction. It will speed it up.
Answer:
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Explanation:
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