Blood is what type of a contaminant? Chemical , Biological, Physical.

please help me for a test

Biological

Explanation:

Biological contamination refers to food that’s contaminated by substances produced by living creatures – such as humans, rodents, pests or microorganisms. This includes bacterial contamination, viral contamination or parasite contamination that’s transferred through saliva, pest droppings, blood or faecal matter.

the number of calories in each pack of cookies has a greater variation than the number of calories in each pack of crackers.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.