Which of the following is an example that includes evidence of a chemical change?

The image shows what happens when cold medicine tablets are placed in room-temperature water. What evidence would indicate that a chemical change has occurred?

A physical change can be distinguished from a chemical change because this happens in a physical change:

Four mixtures are made by combining two clear liquids, and observations are made. Which mixture demonstrates that a chemical change has occurred?

A change in the internal pressure against the cell walls is used by plants for which of the following?

Turgor pressure can help plants move. Internal water pressure can cause -

Geotropism is a force that affects certain organisms. This force will result in which of the following?

Gravity and other forces affect movement within an animal’s body. Which system is responsible for the force that moves blood through the body?

Turgor pressure helps a seed in which of the following ways?

The roots of plants grown on the space shuttle while in orbit around Earth all have different orientations. A logical conclusion is that the irregular root growth is caused by the lack of -

The digestive system’s main function is to -

The endocrine system is responsible for communication in the body using -

Which body system forms a protective barrier between the external environment and the internal body systems?

Which body system is responsible for rapidly communicating information inside the body using electrical impulses?

The main function of which of these body systems is to create the movement a swimmer needs to swim across a swimming pool?

The main function of the excretory system is to -

Roots grow downward in the soil in response to -

When an animal is thirsty, it responds by -

A crocodile quietly stalks its prey, a wildebeest, drinking at a water hole. The wildebeest suddenly sees the crocodile approaching. The wildebeest’s body responds by -

A student places a plant in a dark room next to a growth lamp, while providing sufficient water and nutrients to ensure the plant’s growth and survival. The plant will likely respond by -

When a plant wilts due to lack of water, it is responding to which of the following internal stimuli?

Stunted growth of an animal can be a response to -

When an animal is infected with a virus, the body responds by creating conditions that are not favorable for the virus. It does this by -