Why do solar cells need an inverter? a. they need a way to share their excess energy with the electric company. b. their energy output is alternating current. c. they need a way to store energy for cloudy days. d. their energy output is direct current.

D. Their energy output is in the form of direct current.

Explanation:

The inverter converts the DC to AC so that the appliances that use ac may function. They are mostly connected after the power storage appliances normally batteries before the consumption appliances. Inverters convert direct current electrical energy to alternating current at a given voltage and frequency.

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.