Animal behavior researchers often refer to an activity associated with punishment or reward as a (n) A. stimulus. B. operant. C. response. D. condition.

The term used to identify conditions that are brief and severe is:

What type of pathogen is responsible for epidemics and pandemics

What body system is dependent on a constant supply of iron,?

What is the most likely mode of transmission for a trait that is not expressed in parents but is expressed by one half of the sons?

Contractions of skeletal muscle are involuntary. true false

Which of these is an example of an endoparasitic relationship? O A. A tapeworm living in an animal's intestine O B. A rabbit eating lettuce in a farmer's garden O C. A tick living in an animal's fur coat O D. A snake eating a mouse in a cornfield

Why is the presence of organic material in the soil important? A) It wards away plant eating organisms. B) It increases plant growth. C) It increases sunlight absorption. D) It increases water absorption.

Which derived characteristic is shared by at least four organisms? Large brain Lungs Mammary glands Placenta

Question 2 For an object to remain at rest, which of the following must be true? A. The forces on it are balanced B. There is no friction C. Gravity doesn't act on it D. The object has no mass

Identify another invertebrate chordate other than hagfish.