Many human body systems must interact to maintain homeostasis. Which of the following is an example of the nervous and respiratory systems interacting? (A) toxic molecules cross blood vessel membranes

(B) released enzymes reduce the exchange of gases

(C) coordinated muscle movements control breathing

(D) increased carbon dioxide levels improve digestion

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

Indicate whether the following statements about the biases in the fossil record are true or false. a) inland species are more likely to be preserved than marine species b) organisms with hard body parts are more likely to be preserved than are those composed soft tissues. c) species that existed over a larger area are more likely to be preserved than species existing over a smaller area. d) organisms that lived very long ago are more likely to be found as fossils than organisms that lived relatively recently e) the fossils of larger organisms are more likely to be found than the fossils of smaller organisms

What drives an advertising campaign?