Robin is writing an essay on the earth's temperature. What can he write about that keeps the earth relatively warm at night?

A. ozone layer hole

B. acid rain

C. increase in sea levels

D. the greenhouse effect

E. global warming

Which statement about both type 1 diabetes and celiac disease is true? a.) They are both more common in men. b.) They are both caused by an attack on the endocrine system. c.) They are both caused by exposure to gluten. d.

Which of the following is not part of the frogs nervous system

Describe how genes are transferred.

Hemophilia is caused by several genetic factors; one, a recessive allele of an x - linked gene, is the subject of this problem. assume that a man with hemophilia marries a normal woman whose father had hemophilia.

Which statement is characteristic of reproduction in humans? 1) The reproductive cells of males and females differ in chromosome number. 2) Males and females produce gametes in the ovaries. 3) Males and females produce the same number of gametes.

Slow gradual movement along a fault is called

List three cash crops the europeans wanted the native americans and africans to yield

Which of the following is an example of a structural adaptation? A a wolf's howl B an insect's coloring C a fish's fin D a squirrel storing acorns

For your organ system, describe how the system works at the organ level

One step in a single eukaryotic cell becoming two daughter cells is the process of