Answer: oftentimes you can buy reusable biodegradable bags, but they are more expensive than common plastic bags.
Explanation:
You do it before a lab so as to prevent contamination of the materials. You might have things on your hands that might contaminate the experiment and the research. You do it after because you don't want to have things from your experiments on your hands because that can be extremely dangerous.
Answer:
My guess is, Resident bacteria. I hope this helps!
Explanation:
Some murderers leave behind signatures like objects with their victims or certain type of bodily harm.
The answer is D, all of the above. Sexually transmitted diseases can be spread without the proper use of protection. And unplanned pregnancy may also occur. And a person may experience loss of self-respect because they engaged in sexual relations before marriage.
