The amount of matter is ______ when it changes form, even if there are transitions in which the substance seems to vanish.

Chemical reactions that release energy are called...

Some chemical reactions store energy. We call these reactions...

In a chemical process, the atoms that make up the original substances are regrouped into different molecules, and these new substances have different __________ of those of the reactants.

________ of any type can be subdivided into particles that are too small to see, but even then the matter still exists and can be detected by other means.

The energy released from food was once energy from the ____ that was captured by plants in the chemical process that forms plant matter (from air and water).

Food provides animals with the materials they need for body ____________ and the energy they need to maintain body warmth and for motion.

Plants acquire their material for growth mainly from (select all that apply)

Matter cycles between the air and soil and among ______, ______, & ________ as these organisms live and die.

The food of almost any kind of animal can be traced back to ________.

Some organisms, such as fungi and bacteria, break down dead organisms and therefore operate as ___________.

Organisms can survive only in environments in which their particular needs can be met.

The ________ force of Earth acting on an object near Earth's surface pulls that object toward the planet's center.

The ____ is a star that appears larger and brighter than other stars because it is closer. Stars range greatly in their distance from Earth.

The orbits of Earth around the sun and of the moon around Earth, together with the rotation of Earth about an axis between its North and South poles, cause __________.

The movement of the sun, Earth, and moon in relation to one another cause... (Select all that apply)

Mark all of the following that are considered one of Earth's major systems.

Which of the following is considered a part of the biosphere?

The ______ supports a variety of ecosystems and organisms, shapes landforms, and influences climate.

Nearly all of Earth's available water is in the ocean. Most fresh water is in ________ or _______; only a tiny fraction is in streams, lakes, wetlands and the atmosphere.

Possible solutions to a problem are limited by available materials and resources. These limitations are also called...

The success of a designed solution in engineering is determined by specific...

Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to _________ of atoms

Gases and liquids are made of molecules or atoms that are moving about relative to one another.

In a _______, the molecules are constantly in contact with others; in a ________, they are widely spaced except when they happen to collide. In a ______, atoms are closely spaced and may vibrate in position but do not change their relative position.

In science, heat is defined as energy transferred due to temperature difference between two objects.

A system of objects may also contain stored (potential) energy depending on their relative _______.

___________ is a measure of the average kinetic energy of the particles of matter. The relationship between the temperature and the total ________ of a system depends on the types, states, and amounts of matter present.

Energy is always moving from _____ regions or objects to _____ ones.

As two objects interact, each one exerts a force on the other that can cause energy to be _________ to or from the object.

Which of the following determines the amount of energy transfer needed to change the temperature of a piece of matter? Mark all that apply.

When two objects interact, the force exerted by the first object on the second object is equal in strength to the force that the second object exerts on the first, but in the opposite direction. This is which of Newton's laws? (equal and opposite reaction)

The _____ of an object is determined by the sum of the forces acting on it.

The greater the mass of an object, the greater the _______ needed to achieve the same change in motion.

Which of the following forces act at a distance?

Electric and magnetic forces can be attractive or repulsive, and their sizes depend on the ... (select all that apply)

Gravitational forces are always attractive.

Forces that act at a distance can be explained by ______ that extend through space and can be mapped by their effect on a test object.

A simple wave has a repeating pattern with a specific... (select all that apply)

When light encounters an object, all of the following things can happen. (select all that apply)

The path that light travels can be traced as a __________ except between different transparent materials where the light bends.

Organisms may consist of one single cell (________) or many different number of cells (_________)

Subsystems within the body are groups of cells called

Which of the following use the energy from light to make sugars from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen? (Mark all that apply)

________ signals (sent as wave pulses) are a more reliable way to encode and transmit information.

The seasons are a result of Earth's ______ and are caused by the different intensity of sunlight on different areas of Earth across a year.

Earth and its solar system are part of the ___________ which is one of many galaxies in the universe.

Plants reproduce in a variety of ways, sometimes depending on _________ and ________ for reproduction.

Growth of organisms and population increases are limited by access to ______.