Choose the answer choice that best completes the following sentence.

the comets in the oort cloud may take up to earth years to orbit the sun just once.

answer choices
20 million earth years

30 million earth years

10 million earth years

5 million earth years

The great scientist alfred wegener proposed that continents have moved, while other scientists such as t.c.chamberlin argued against wegener. wegener's ideas eventually won, and are now widely accepted, because: a) wegener's ideas were more beautiful, and so were favored by the intellectual elite.b) wegener's ideas did a better job of predicting the results of new observations and experiments.c) wegener's ideas appealed to dead white european males, whereas chamberlin's didn't.d) wegener's ideas appalled dead white european males, and we all know that in this politically correct era,dead white european males cannot get a fair shake.e) wegener won the nobel prize.

Which of the following describes the relationship between elements of an ecosystem

What is a social problem that affects your life? how does it affect you, your family, and/or your community?