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What structures formed of twisted actin chains are found in almost every cell, and are numerous in muscle cells and cells that move by changing shape?

asked Jan 7 in Science by BradleySkt2 (270 points)

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What is the term for sheets of cells that form a boundary between a mass of cells and a cavity or space?

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What line of latitude is an equal distance from both the north and south poles?

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What kind of muscle is responsible for making the human heart beat?

asked Jan 7 in Science by BeckyDalgarn (410 points)

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What is the major source of warmth for earth?

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What remains a constant of radioactive substance over time?

asked Jan 7 in Science by MarthaLeung9 (610 points)

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What relatively new addition to and highest level of the system of taxonomic classification includes just three divisions, the eukarya, the archaea, and the bacteria?

asked Jan 7 in Science by JannetteVdl (650 points)

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What natural destructive element cuts away at rock forming river valleys?

asked Jan 7 in Science by VeraDrew6824 (330 points)

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What is the main makeup of the cell membrane?

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What moves nitrogen back and forth between the atmosphere and organisms?

asked Jan 7 in Science by ErvinNeill87 (630 points)

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What is the term for very large arrays of tandemly repeating, non-coding dna?

asked Jan 7 in Science by BereniceStre (370 points)

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What is the term for materials that have been left behind by organisms that once lived?

asked Jan 7 in Science by JanIson45680 (430 points)

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What is the addition of oxygen to a molecule or the removal of hydrogen from a molecule called?

asked Jan 6 in Science by MelbaRacine (390 points)

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What is the only way of transferring energy that doesn't require matter?

asked Jan 7 in Science by TiaPritt9171 (470 points)

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What technology do scientists use to create models?

asked Jan 7 in Science by RoyceColquho (510 points)

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What takes place in the organelle known as the chloroplast, which distinguishes animal from plant cells?

asked Jan 7 in Science by DomingoMarce (750 points)

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What phenomenon, crucial for evolution, creates new genetic variation in a gene pool and is how all new alleles first arise?

asked Jan 7 in Science by Latanya48975 (350 points)

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What is the term for individuals of a species that live in a particular habitat?

asked Jan 7 in Science by SuzanneDewee (530 points)

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What is the name of an extreme form of radiation fog?

asked Jan 7 in Science by SteveBartos1 (480 points)

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What is the health-threatening smoke exhaled by a cigarette smoker or released from tobacco products?

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