The levels of organization from smallest to largest in living organisms are: atoms, molecules, cells, tissues, organs, organ systems, and organisms. Each level is more complex and is made up of the previous level.
Living organisms are highly structured and follow a fall in organization from smallest to largest. The smallest and most fundamental unit of matter is the atom, which consists of a nucleus surrounded by electrons. Atoms form molecules, where a molecule is a chemical structure consisting of at least two atoms held together by a chemical bond. Some biologically important molecules are macromolecules, which are large molecules typically formed by combining smaller units called monomers.
At a higher level of organization, molecules combine to form cells, which are the basic unit of life. A group of cells that work together to perform a specific function is called a tissue. Several tissues combine to form an organ, such as the heart or liver. Multiple organs then work together in an organ system, like the digestive system or circulatory system. Finally, all the organ systems in the body combine to form a complex living organism, such as a human. Thus, the levels of organization from smallest to largest are: atoms, molecules, cells, tissues, organs, organ systems, and organisms.
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B. inactive genes in dolphins
C. fossil footprints left by dinosaurs
D. remnants of bacteria colonies dating to 3.5 billion years ago
b iis to prevent wind erosion
c is to increase weathering
d is to prevent deposition
The answer is; B
Sometimes winds carry the sand of the beaches causing erosion. The fences act as breakers of this wind erosion. As wind tries to carry the sand, they encounter the fence and 'break'. Therefore, the sand is deposited along the fence forming a sand dune. These dunes also form protection from storm surges.
Answer and Explanation:
In the DNA molecule, that is formed by two strands of nucleotides, makes sense that each nucleotide is strongly bond to one another while the strands have weaker bonds, for one particular reason.
The double-stranded nature of the DNA is a key element in its correct functioning. When the DNA needs to be "unzipped" for certain processes such as replication and transcription, the weak hydrogen bonds that connect the two strands are broken. If the bonds between the strands were stronger, much more energy would be needed to perform the processes mentioned before, and that wouldn't be beneficial for the cells.
If the cell membrane does not allow the water or solute particles to pass through it then the cell will be deficient in those particles which could even lead to the deathof cell.
The animal cell has an outermost covering which is known as the cell membrane or the plasma membrane. It is selectively permeable in nature. It only allows some solute particles to move across it. The cell membrane does not allow all the particles to move across it, as a result the restricted particles requires a protein or ligand through which it can cross the membrane.
Cell membrane is made up of phospholipids and membrane proteins. Their is a lipid-bilayer in which some proteins are embedded are known as integrated proteins and some are present on the membrane. Cell membrane is present in all types of cells, however a cell wall is also present in plants outside the cell membrane.
Learn more about Cell membrane here:
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