Analyze the diagram. It shows two human body systems working together. In what way are these two systems working together? A) The circulatory system is providing nutrients to the digestive system.

B) The skeletal system is protecting the nervous system.

C) The respiratory system is supplying oxygen to the circulatory system.

D) The digestive system is providing nutrients to the excretory system.

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

What must happen before a body cell can begin mitotic cell division