An electron microscope is usually used for microorganisms that are

too small to be seen with the unaided eye
too small to be seen with an optical microscope
not possible to observe with any instrument

How can you approximate the number of calories required to keep you in energy balance?

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment