What key features do Mars rovers have ?

Rovers have wheels and specialize in moving around. They land on the surface of Mars and drive around to different spots. It has a general structure which protects the vital parts of the rover. It has temperature controls as well as computers and cameras in its head and neck to transmit info to scientists. It also has arms for mobility and reach.

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i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.