What's the two methods that scientists can use to determine whether two species (modern or extinct) are closely related

The following statements can be classified as describing only a hypothesis, only a theory, or both. Look at the following answer choices and determine which belongs only in the hypothesis category. A.

DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Today, instead, DDT is largely useless against many insects. What would need to be true for pest eradication efforts to have been successful in the long run?

Which of the following organisms represents a list of nekton animals. A.) fish, lobster, clam B.) algae, seaweed, shrimp C.) fish, squid, ray D.) crab, lobster, clam

Which represents a negative impact of technology? O A. Increased recycling O B. Renewable energy sources O C. Higher food production O D. Climate change

What role do the bones of the skeletal system play in breathing?

A hiker climbs a hill. How does the potential energy of the hiker change as she climbs higher?

Match the following events with the appropriate stage / process of cell division: Centrosome movement Homologous chromosomes separate DNA exchange Chromatids separate A. Prophase I B. Anaphase I C. Crossing over D. Anaphase II E. Prophase II F.

What are the 3 smaller parts of an atom? what are their charges?

List five invertebrate groups in the animal family tree

Where does the energy that drives the water cycle come from