Why old system of measurement isn't accepted nowadays ​

We can measure the length of an object by using 'hand span', 'forearm length', or 'footstep' as the units of measuring length. But hand span, forearm length and footstep cannot be used as a standard unit's measurements because their length is not the same for all the persons.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

what is shown in the image?

eukaryote

chloroplast

mitochondrion

submitted