LEVELS OF ORGANIZATION Identify each of the following as: A. Ecosystem B. Habitat C. Community
D Population

1. The classroom

2. All the mice in the classroom

3.Only the mice, humans, earthworms, and fish in the room

4.The aquarium (wet soil with dead organisms) that the earthworms live in

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.