Q: What simple machine works with a wheel and axle in a wheelbarrow? Read this paragraph and choose the correct option from the provided answers: Look at the wheelbarrow in the Figure below . It is used to carry heavy objects. It consists of two simple machines: a lever and a wheel and axle. Effort is applied to the lever by picking up the handles of the wheelbarrow. The lever, in turn, applies upward force to the load. The force is increased by the lever, making the load easier to lift. Effort is applied to the wheel of the wheelbarrow by pushing it over the ground. The rolling wheel turns the axle and increases the force, making it easier to push the load. Choices: - pulley - hammer - blade - lever A:
lever

Q: How many variables are used to describe the condition of a gas? Read this paragraph and choose the correct option from the provided answers: Recall from the kinetic-molecular theory that gas particles move randomly and in straight lines until they elastically collide with either other gas particles or with one of the walls of the container. It is these collisions with the walls of the container that defines the pressure of the gas. Four variables are used to describe the condition of a gas. They are pressure , volume , temperature , and the amount of the gas as measured by the number moles . We will examine separately how the volume, temperature, and amount of gas each affect the pressure of an enclosed gas sample. Choices: - five - one - three - four A:
four

Q: Q: What are bacteria that stain purple are called? Read this paragraph and choose the correct option from the provided answers: Bacteria that stain purple are called gram-positive bacteria. They have a thick cell wall without an outer membrane. Choices: - gram-neutral bacteria - gram-negative bacteria - complex bacteria - gram-positive bacteria A:
A: gram-positive bacteria

Question: Q: What organ do we use to hear sound? Read this paragraph and choose the correct option from the provided answers: The organ that we use to hear sound is the ear. Almost all the structures in the ear are needed for this purpose. Together, they gather and amplify sound waves and change their energy to electrical signals. The electrical signals travel to the brain, which interprets them as sound. Choices: - eye - antennae - amplifier - the ear A:
Answer: the ear

*Question*
Q: What type of joint is the knee joint? Read this paragraph and choose the correct option from the provided answers: Hinge Joint. The knee joint is a hinge joint. Like a door hinge, a hinge joint allows backward and forward movement. Choices: - ball joint - pivot joint - condyloid joint - hinge joint A:
**Answer**
hinge joint

(Question)
Q: A salt concentration of 32 percent is nearly ten times that of what abundant resource? Read this paragraph and choose the correct option from the provided answers: Choices: - oxygen - fresh water - algae - seawater A:
(Answer)
seawater