Which of the following is a characteristic of vertebrates? a. stinging cells b. an inner skeleton made of bone or cartilage c. a hard exoskeleton made of chitin d. a hard outer shell

How do cells grow and reproduce to maintain homeostasis?

The rapid decomposition of organic matter produces evidence which supports: the slow accumulation of coal deposits long ages of the earth rapid burial of vast amounts of vegetation biblical account of noah's flood

How energy move through ecosystem ?