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December 2025

42,840 public questions were asked this month.

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Recent questions

Latest from December 2025

Which of these definitions have been paired with the correct type of cell? Blood cells are elongated cells that can contract. Neurons are cells that conduct electrical impulses. Epithelial cells are cells that carry oxyg...
Asked by CHRIS 1 answer
Cell differentiation depends on changes in expression.
Asked by CHRIS 1 answer
What role do red blood cells play in the human body? They protect against injury. They protect against disease-carrying microorganisms. They transport oxygen throughout the body. They aid in blood clotting.
Asked by CHRIS 1 answer
Which type of cell can duplicate indefinitely? stem cell blood cell muscle cell neuron
Asked by CHRIS 1 answer
What role do white blood cells perform in a human body? protect against pathogens conducting electrical impulses secreting enzymes carrying oxygen
Asked by CHRIS 1 answer
Scientists study salamanders and their ability to regenerate lost legs and tails. What additional information is essential for scientists to understand in order to apply this ability to humans who have lost limbs? how qu...
Asked by CHRIS 1 answer
Which is the end result of cytokinesis from a cell undergoing mitosis? one cell that has two identical copies of DNA one cell that has two different copies of DNA two cells that have two identical copies of DNA two cells...
Asked by CHRIS 1 answer
In which of these stages is mitosis most important? A tiger cub is born. A tiger cub learns to walk. A tiger cub begins to grow. A tiger cub play-fights.
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Centromeres split apart during
Asked by CHRIS 1 answer
Which statement accurately describes the relationship between cytokinesis and mitosis? Mitosis includes interphase and cytokinesis. Cytokinesis precedes mitosis in the cell cycle. Cytokinesis is not a phase of mitosis, b...
Asked by CHRIS 1 answer
After chromosomes are formed, during which phase of mitosis do the chromosomes attach to the spindle fibers by their centromeres? anaphase prophase metaphase telophase
Asked by CHRIS 1 answer
Which statement best describes cancer cells? They grow as a single layer of cells. They cease to reproduce after 20–50 mitotic divisions. They reproduce only when needed to replace missing cells. They are not regulated b...
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Explain the difference between gene flow and genetic drift.
Asked by Chuck Bass 1 answer
An example of mitosis at work is a leaf turning yellow. growing. taking in carbon dioxide. performing photosynthesis.
Asked by CHRIS 1 answer
An example of mitosis at work is a plant root elongating. absorbing. pointing down. breaking.
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List at least three factors that can affect the genetic variation within a population.
Asked by Chuck Bass 1 answer
Which statement about anaerobic respiration is true? Anaerobic respiration prevents muscle fatigue. Anaerobic respiration generates a high yield of ATP. Anaerobic respiration is used commercially in the production of bee...
Asked by CHRIS 1 answer
Gene sequencing allows scientists to decode the of an organism, its full set of genetic information.
Asked by Chuck Bass 1 answer
Consider the stage of cellular respiration that is shown in the diagram. A diagram shows the conversion of a glucose molecule to 2 pyruvic acid molecules. In this process, 2 A T P form 2 A D P, 2 N A D produce 2 N A D H,...
Asked by CHRIS 1 answer
What is the main difference between aerobic respiration and anaerobic respiration? Aerobic respiration requires oxygen to proceed, but anaerobic respiration does not. Aerobic respiration occurs during photosynthesis, but...
Asked by CHRIS 1 answer
Compared to larger populations, smaller populations of organisms, such as some groups of cheetahs in East Africa, accumulate mutations at a faster rate within the population. This accumulation of mutations increases the...
Asked by Chuck Bass 1 answer
Scientists observing a species of fish notice that some individuals exhibit a lack of dark pigment, a condition known as oligomelanism. A survey of the population years later does not find any oligomelanic fish. This los...
Asked by Chuck Bass 1 answer
The graphic shows the citric acid cycle. A diagram of the citric acid cycle is shown. Acetyl C o A enters the citric acid cycle and combines with a 4-carbon compound to form citric acid. During the citric acid cycle, wha...
Asked by CHRIS 1 answer
In genetic engineering, scientists attempt to manipulate DNA in ways other than natural processes. True False
Asked by Chuck Bass 1 answer
The Venn diagram compares aerobic respiration and anaerobic respiration. A Venn diagram is shown. One circle is labeled aerobic and the other circle is labeled anaerobic. Which statement could be categorized only in the...
Asked by CHRIS 1 answer