How are the front limbs different from the hind limbs on a frog

Witch type of microscope is used to view very small cell components like proteins and dna?

Lola needs to sign 6 invitations. using stopwatch that measures time to tenths of a second, it takes lola 5.3 seconds to sign her full name. going by the accuracy of the stopwatch, which is the most accurate determination for the number of minutes lola needs to sign all 96 invitations

What part of the brain is highlighted in the diagram below?