What did milankovitch propose as the main cause of ice age

Which substance is considered a building block for all living things? hydrogen glucose carbon protein

Why are black bears not found in groups?

The Neanderthal skeleton known as the "old man" showed evidence of many injuries over a long life. Several broken bones had healed, and almost all of his teeth had fallen out. What does this most likely indicate? A.

Which statement about the two rocks is true and why

All animals are heterotrophs. a. True b. False

Where do electrons get their energy in photosystem 2

Using no more than 13 propositions, compare and contrast the effects of the autonomic divisions.

In water, hydrogen bonds hold together

The wall of the alveolus (air sac) in the lung is composed of which type of epithelium? hints the wall of the alveolus (air sac) in the lung is composed of which type of epithelium?

How is the rainforest in nicaragua ranked in the americas?