Although bacteria can be seen without staining, not all of their characteristics can be visible. Thus, with staining one can see if the bacteria is gram positive or negative, the outer wall's or capsule's structure, the exact size and texture of the surface etc. Without staining, it would be very difficult if not impossible to differentiate between different bacteria types.
Fixing a bacteria allows the scientist to immobilize and preserve it. Thus a complex study can be performed over a longer period of time. The bacteria can also be preserved in order to be restudied at a later date.
ionic bonding.
Ionic bonding<span> is a type of </span>chemical bond<span> that involves the </span>electrostatic attraction<span> between oppositely charged </span>ions<span>, and is the primary interaction occurring in </span>ionic compounds<span>. The ions are atoms that have gained one or more </span>electrons<span> (known as </span>anions<span>, which are negatively charged) and atoms that have lost one or more electrons (known as </span>cations<span>, which are positively charged). This transfer of electrons is known as </span>electrovalence<span> in contrast to </span>covalence<span>. In the simplest case, the cation is a </span>metal<span> atom and the anion is a </span>nonmetal<span> atom, but these ions can be of a more complex nature, e.g. molecular ions like NH</span>4+<span> or SO</span>42−<span>. In simpler words, an ionic bond is the transfer of electrons from a </span>metal<span> to a </span>non-metal<span> in order to obtain a full valence shell for both atoms.</span>
Answer: it will be A..
Explanation: Gene flow is the transfer of genes across two populations. This happens if there is mating between the two populations. However, this can be curtailed either by allopatry (due to geographical isolation) or sympatry (due to behavioral isolation) which results in reproductive isolation between the two populations. If the two population were of the same species, then the reproductive isolation can result in divergent speciation of the two populations.
A scientist can study <span>the relationship between the Tiktaalik roseae and modern fish and tetrapods by creating </span>a diagram that hypothesizes ancestry relying on the fact that common descent<span> describes how, in </span>evolutionary biology<span>, a group of </span>organisms<span> share a </span>most recent common ancestor<span>.</span>
Answer: Option 'C' is correct.
Explanation:
Since we have given that
Area of triangle LMN = 18 ft²
Area of triangle FGH = 24 ft²
Since Δ LMN and ΔFGH is equivalent triangles.
As we know the theorem which states that ratio of areas of equivalent triangles is equal to square of ratio of corresponding sides.
So, it becomes,
Hence, Option 'C' is correct.
