Why must erythroblast have a nucleus​

Explanation:

Erythrocytes, commonly called red cells, are the cellular elements of blood that perform the unique function of ensuring proper oxygen delivery to the tissues. ... Diagrammatic scheme of the interaction between an erythrocyte and a macrophage during the process of enucleation.

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it's c. (to reduce the greenhouse effect/carbon gasses)

starchy vegetables are high in carbohydrates.

starchy vegetables contain more carbohydrates than non-starchy vegetables.

explanation:

there are two primary categories of carbohydrates, essentially differentiated on the basis of their carbohydrate content (which is in the form of starch - a complex carbohydrate):

those vegetables which contain little amounts of starch are termed as non-starchy vegetables, and some examples include: artichokes, broccoli and bean sprouts.

vegetables high in their starch content are distinguished as starchy vegetables, and some examples include: potatoes, chickpeas and corn.