<span>Osteoclasts
</span><span>Are derived from stem cells that produce macrophages
Secrete acids and protein-digesting enzymes</span>
PLEASE HELPPP :,,,,,,,,,,,)
dem82 [27]
I believe the answer is A
Hope this helps!
Brain energy requirement, metabolism and neurotransmitter turnover consume 20 % of the available oxygen and glucose in the body.
<span>Even though, the brain is only about 2% of the body weight, it consumes about 20% of the body's energy. It is the main consumer of glucose-derived energy. When the mental strain increases, the brain's demand for energy in the form of oxygen and glucose is higher.</span>
Matter: Gases,plasma,melting &freezing, solids, vapor
Not Matter: time,sound,sunlight,heat,gravity
False because many different species are going extinct within our lifetime
