Answer:
A substance is pure if it is a single substance, and it is made up of only one type of particle. If there is more than one substance, and therefore more than one type of particle, it is a mechanical mixture, the particles can be easily distinguished, due to their non-uniform composition. The composition of a mechanical mixture is variable and their components may be separated by physical or mechanical means because they are not chemically bound.
Explanation:
A pure substance is one that has a composition and characteristic properties that do not change, whatever the physical conditions in which it is found; that is, the physical transformations do not affect it. In other words, pure substances will be made up of particles that are identical to each other. Mechanical mixture are the result of the physical union of two or more substances which are called components, these can be elements or compounds, whose particles do not mix uniformly. The components of the mixtures have different properties, such as the state of aggregation, the density or the solubility. These properties allow substances to be identified and facilitate the separation of the components of a mixture, that is, through physical or mechanical processes we can isolate and obtain the components that make up the mechanical mixtures.
Answer:
Option D, Anabaena
Explanation:
Some filamentous cyano bacterias during nitrogen starvation produces heterocysts which are specialized cells that are capable of fixing nitrogen.
Some common example of these bacteria's are - Cylindrospermum , Anabaena and Nostoc etc.
Anabaena fix the nitrogen in the vegetative cell through a filament under aerobic conditions when there is lack of fixed nitrogen either Ammonia or nitrate.
Hence, option D is correct.
Answer: by pushing the epiphysis away from the diaphysis.
Answer:
The answer is: corpus callosum
Explanation:
Research has indicated that Corpus Callosum is responsible to show the differences of sex in humans. Splenium which is the posterior portion of the Corpus Callosum is larger in women than in men.
The answer is B. The can lose their form/function and become denatured with extreme temperature or pH variations.