Explain how scientists determined Earth's age and state this value.

Mark knows that animals reflexively blink when air is puffed at their eyes. Now Mark wants to use this fact and classical conditioning to train a rat to blink when it hears a tone. He has just started presenting the tone to the rat.

If the discovery of dna were to happen today what might have been different

A sand bar that completely crosses a bay, sealing it off from the open ocean, is called what

Once proteins are moved to the Golgi apparatus, what is the role of this organelle? A. to use proteins as an energy source B. to link amino acid chains to proteins C. to process, sort, and deliver proteins D. to protect proteins from bacteria

Design an Experiment Question: What is the effect of day length on plant growth? Hypothesis: Plants will grow more when the day is longer. What is the dependent variable in your experiment? What is the independent variable?

If you were standing at the end of a pier with a stopwatch in hand, how would you measure the average wave period of the waves that pass by? •Why do successive (one after the other) waves that arrive at the beach have different heights?

Has anyone done the "effect of cell size on material transport" lab? It's about potatoes?

A diamond has a density of 3.5 g/cm what is the mass of a diamond with a volume of 3.0cm

How does the arrangement of atoms and bonds change

4. All of the following are types of symbiotic relationships except for