The advantage of van Leeuwenhoek's microscopes was that a. they were simple.
c. the lenses could be moved.
b. they had two lenses.
d. the lenses were ground very precisely.

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder

Sediment layers stop lateral spreading when: they encounter a barrier they encounter an opposing current they run out of additional sedimentary material