Why do doldrums at the equator have calm winds?

The Doldrums are caused by solar radiation from the sun, as sunlight beams down directly on area around the equator. This heating causes the air to warm and rise straight up rather than blow horizontally.

hope this helps :)

The Doldrums are caused by solar radiation from the sun, as sunlight beams down directly on area around the equator. This heating causes the air to warm and rise straight up rather than blow horizontally.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.