D)
Because a scientific theory is something that has been proven over the trials of many tests
Hope that helps :)
A compound light microscope magnifies objects in steps.
An electron microscope is the type that was used to observe the first strands of DNA.
A compound light microscope contains a series of lenses.
A compound light microscope includes magnifying glasses.
An electron microscope creates a digital image.
A simple light microscope uses one lens for magnification.
Answer:
They contain protein fibres that can contract when energy is available, making the cells shorter.
