Which of the following plants is grown from a bulb

Onions, garlic (Allium sativum) and shallots (Allium cepa var. aggregatum) are grown from bulbs. While they can be grown from seed, many gardeners prefer to speed up the process by starting their plants from bulbs, which are smaller undeveloped forms of the plants.

Explanation:

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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digestion

it excretes wastes