When Did Land Plants First Contribute to Biologic Weathering and Soil

question 37

Essay

When did land plants first contribute to biologic weathering and soil formation?

Recognize the contributions of key psychologists to the study of observable behaviors.

Explain the concept of learning as a change in behavior or knowledge due to experience.

Understand the process of extinction in classical conditioning and its implications.

Grasp the significance of observational learning and modeling in the acquisition of new behaviors.

---

Definitions:

Lymphocytes

Granular leukocytes formed in lymphoid tissue. Lymphocytes are generally small. See T Lymphocyte and B Lymphocyte.

Interferon

A protein that blocks viruses from infecting cells.

Chemical Barrier

A defense mechanism in the body that uses chemicals (such as acids or enzymes) to protect against pathogens and foreign substances.

Nonspecific Defense

General immune responses that a body provides against pathogens regardless of their specificity.