As a forensic expert, Jane needs to handle many biological evidence samples simultaneously. What is the basic precaution that she should take while doing so?
OA
air dry all the samples
B.
use a new pair of gloves for each piece of evidence
malaman
store samples in humid conditions
Ос.
OD.
use plastic bag for storage

B.  use a new pair of gloves for each piece of evidence

Explanation:

When it comes to the basic precautions of handling biological evidence samples, one has to prevent cross contamination. This refers to the transfer of DNA from one evidence to another evidence; thus, it is important for Jane to use a new pair of gloves for each piece of evidence in order to prevent such occurrence.

Wearing of gloves will also prevent Jane's DNA from being implanted into the sample, and it will keep her safe from contracting blood-borne pathogens like those in the saliva, blood or semen.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )