Hello there!
The majority of human cancers are caused by _______
<span>the accumulation of mutations
Hope this helps and have a great day! :)
</span>
Ligaments<span> - a tough band of tissue that holds the ends of bones </span>together<span> at a </span>joint Joints<span> - where two or more bones meet </span>together<span> Tendons - cords of connective tissue that attach muscle to bone Muscles and tendons attach to bones on either side of a </span>joint<span>, </span>holding<span> the bone(s) </span>together<span> tightly In the human body</span>
Answer:
Neither observer nor subjects know which subject receives the vaccine and which receives a placebo
Explanation:
In a double-blind study neither the participants nor the experimenters is aware of who is receiving a particular treatment.
Its used to prevent bias in research results from demand characteristics or the placebo effect
