What flowers usually have either three petals or a multiple of three petals?

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen

If you relate the doppler effect on sound to the color of light waves, a police car would be the color as it approaches and the color as it recedes away from the observer.

Bio molecules are essential to all living things. which biomolecule is “d” from the table