21) Coordinating body functions via chemical signals is accomplished by

A) the respiratory system.

B) the endocrine system.

C) the immune and lymphatic systems.

D) the integumentary system.

E) the excretory system.

Which statement is true about crocodilians? Check all that apply. Crocodiles attacks happen more than alligator attacks Crocodiles can live up to 90 years Crocodiles survived when dinosaurs were around Crocodiles are more aggressive then alligators

What would happen to an egg that had a nonfunctional chorion? a. The embryo would suffocate or dehydrate. b. The embryo would starve in the egg. c. The embryo would die due to high levels of toxic metabolic wastes. d.

Explain how the numerous factors used to measure climate contribute to the large variety of instruments required to measure climate change

How does a mutation affect a gene? A. A mutation changes the sequence of DNA bases in a gene. B. A mutation creates the sequence of traits in a gene. C. A mutation creates the sequence of RNA bases in a gene. D.

Introduction to the human digestive system?

Conduction of nerve impulses is possible because of the

What is one similarity between replication and transcripton

Fossils on the continent may be similar to fossils on another continent. This observation supports which theory?

Jane filled one transparent bottle and one brown bottle of the same capacity with pond water. She kept the first bottle in sunlight and the second in dark. After one hour she calculated the amount of oxygen present in both the bottles.

The kingdom contains all autotrophic organisms.