Identify the person who made the correct statement.
juan said fossils deposits always contain only one type of organism.
christina said fossils deposits never contain one type of organism.
a. juan is correct.
b. christina is correct.
c. neither juan nor christina are correct.
d. both juan and christina are correct.

The answer is:  [C]:  Neither Juan nor Christina are correct.

Explanation:

Consider Juan's statement:

"Juan said fossils deposits always contain only one type of organism."

This statement is incorrect.  There are many instances of fossil deposits containing more than one type of organism.

Consider Christina's statement.

"Christina said fossil deposits never contain one type of organism."

This statement is incorrect.  Fossil deposits, by definition (of "fossil") ALWAYS contain at least one type of organism.

As such, neither Juan nor Christina are correct. 
   And as such, Answer choice: [C] is the correct answer.

Answer choices A, B, and D are ruled out.

The charge of an ion with 55 protons and 52 electrons is +3. the reason is because protons are positive, and there are three more than the amount of negative electrons.