energy conservation and transfer
atmosphere, weather and climate
forces and motion
human body and protists
heredity and genetics
100
a short, slender, sharp-pointed metal pin with a raised helical thread running around it and a slotted head, used to join things together by being rotated so that it pierces wood or other material and is held tightly in place.
What is screw
100
pellets of frozen rain that fall in showers from cumulonimbus clouds.
What is hail
100
the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.
What is gravity
100
Plant cells are eukaryotic cells that differ in several key aspects from the cells of other eukaryotic organisms. Their distinctive features include.
What is plant cell
100
deoxyribonucleic acid, a self-replicating material present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.
What is DNA
200
any of the basic mechanical devices for applying a force, such as an inclined plane, wedge, or lever.
What is simple machine
200
Air pressure is the force exerted on you by the weight of tiny particles of air (air molecules). Although air molecules are invisible, they still have weight and take up space. Since there's a lot of "empty" space between air molecules, air can be compressed to fit in a smaller volume.
What is air pressure
200
increase in the rate or speed of something.
What is acceleration
200
any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.
What is tissue
200
a person serving as the starting point for the genetic study of a family (used especially in medicine and psychiatry).
What is pro-band
300
the point on which a lever rests or is supported and on which it pivots
What is fulcrum
300
the boundary of an advancing mass of warm air, in particular the leading edge of the warm sector of a low-pressure system.
What is warm front
300
the resistance that one surface or object encounters when moving over another.
What is friction
300
a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.
What is organ
300
a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.
What is meiosis
400
energy that a body possesses by virtue of being in motion
What is kinetic energy
400
the weather conditions prevailing in an area in general or over a long period.
What is climate
400
a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.
What is magnetism
400
a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants, it consists mainly of cellulose.
What is cell wall
400
having a single set of unpaired chromosomes.
What is haploid
500
Energy transformation or energy conversion is the process of changing one form of energy to another. In physics, the term energy describes the capacity to produce certain changes within a system, without regard to limitations in transformation imposed.
What is energy transformation
500
moisture condensed from the atmosphere that falls visibly in separate drops
What is rain
500
the rate at which someone or something is able to move or operate
What is speed
500
An animal cell is a type of eukaryotic cell that dominates most of the tissue cells in animals. Animal cells are different from plant cells because they lack cell walls and chloroplasts, which are pertinent to plant cells.
What is animal cell
500
one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
What is Allele
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