Which best contrasts electric doorbells and audio speakers? O Doorbells involve rapid changes in the direction of current, and speakers do not.
O Speakers involve rapid changes in the direction of current, and doorbells do not.
O Doorbells require closed circuits in order to work, and speakers do not.
O Speakers require closed circuits in order to work, and doorbells do not.
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Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

Which best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b.organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.

Which animal is a producer in this ecosystem