From your first part of the question, Muscle cells are the cells that make up our muscles. They are specialized cells that have fibers in them that contract as you move. This contraction causes the cell to change shape. The main function of muscle cells is to allow for body movement. Almost every part of the body has a muscle cell. Muscle cells contain mitochondria, nucleus and cell membrane just like all other cells.
Well, for the second question, The myofibres cause skeletal and cardiac muscles to appear striated because they are cyndrical and long, extending across the entire surface of the muscle. There are two types of striated muscle: skeletal muscle and cardiac muscle.
Chaparral biomes are very similar to desserts so animals and other organisms that require water usually obtain it from groundwater sources. However, when groundwater is not available, these organisms may obtain water from plant life that stores water. Other organisms are adapted to hydrolyze fats in their body to release water in order to fulfill their energy requirement and water requirement.
Answer: According to the National Academy of Sciences (NAS), a scientific theory is “a well-substantiated explanation of some aspect of the natural world that can incorporate facts, laws, inferences, and tested hypotheses.” No amount of validation changes a theory into a law, which is a descriptive generalization about nature. So when scientists talk about the theory of evolution—or the atomic theory or the theory of relativity, for that matter—they are not expressing reservations about its truth.
Explanation: The theory of evolution, meaning the idea of descent with modification, one may also speak of the fact of evolution. The NAS defines a fact as “an observation that has been repeatedly confirmed and for all practical purposes is accepted as ‘true.’” The fossil record and abundant other evidence testify that organisms have evolved through time. Although no one observed those transformations, the indirect evidence is clear, unambiguous and compelling.
The attached picture shows how bacteria gain antibiotic resistance. Firstly, a few individuals attain a
beneficial mutation in their genetic material that accords them the capability to survive in an antibiotic. The
individuals are hence able to survive and
reproduce more than those individuals without the mutation. There is, therefore, a genetic
shift in the population in favor of the resistant genotype. After generations, the
whole population becomes antibiotic resistant.
Answer:
An ecosystem includes the ways these organisms live, feed and reproduce within that particular area. Ecosystems contain many components, but the four main things needed in an ecosystem are plants, animals, rocks and minerals, and water.
