Potassium ions $\left(\mathrm{K}^{+}\right)$have a positive charge. What happens to a potassium atom's electrons when it becomes an ion?

How does the manipulation of an independent variable during a scientific experiment allow a scientist to find a cause-and-effect relationship between variables?

What is the difference between a hypothesis and a theory?

Explain how scientists use observations and data to develop a hypothesis.

Evidence shows that hippos and whales are closely related organisms. How might evolution and adaptation account for similarities and differences between them?

How does negative feedback act to maintain homeostasis in living things?

Give an example of how structure and function are related in an organism.

Briefly describe the basic characteristics that all living things on Earth have in common.

In general, greater biodiversity exists closer to Earth's equator than in areas closer to Earth's poles. What does this mean in terms of the number of species that are found in these regions?

The prefix homeo-comes from a Greek word that means "same." The suffix -stasis comes from a Greek word that means "stoppage," or "standstill." How are these definitions related to the meaning of homeostasis?

The prefix bio- means "life." How does this meaning relate to the definitions of terms that contain the prefix bio-?

Explain the differences between the terms in the following sets. observation, data

At $50 ^ { \circ } \mathrm { C }$ the ion-product constant for $H_2O$ has the value $K _ { w } = 5.48 \times 10 ^ { - 14 }$ Based on the change in $K_w$ with temperature, predict whether $\Delta H$ is positive, negative, or zero for the autoionization reaction of water: $2 \mathrm { H } _ { 2 } \mathrm { O } ( l ) \rightleftharpoons \mathrm { H } _ { 3 } \mathrm { O } ^ { + } ( a q ) + \mathrm { OH } ^ { - } ( a q )$

What is the relationship between a polymer and a monomer?.