Answer: I would think A but get a second opinion to be 100% sure, okay.
If the question were why can’t a mutated RAS gene stop uncontrolled cellular division/cancer I could easily answer the question. So if you also need that answered I could just saying.
Answer:
Preadaptations like tegument and body segmentation could have been used by insects and millipedes to survive in terrestrial habitats.
Explanation:
As crustaceans, millipedes and insects have a protective, hard tegument, which surface is frequently smooth. Some groups can also present spines, bristles, or tubercles. The tegument protects the animals against harmful stimuli of different nature, such as mechanic, thermal, chemical, etc. It is also an effective barrier against pathogen microorganisms and excessive dehydration. In groups like crustaceans and insects, as the external layer gets hard, the tegument constitutes an important support organ. It is composed of a simple, cubic epithelium called hypodermis, and secretes exoskeleton, which is composed of chitin and can also be shaped by calcareous impregnations. Chitin is an impermeable, light y hard substance, that allows life on land without dehydration. Segmentation (repetition of identical anatomical units) is another characteristic in these groups that have helped to domain terrestrial habitats. It seems like segmentation is highly advantageous from an evolution point of view because it is much easier to adapt each segment separately to environmental pressures, responding to different necessities, than adapting the whole body to it, developing a new organ for each necessity. Also, it is a strategy to defend themselves from predators by rolling up.
Nucleic acids are polymers of nucleotides. The monomers of nucleic acids consist of a phosphate group, a five-carbon sugar, and a nitrogenous base.
<h3>Nucleotides and DNA</h3>
DNA (deoxyribonucleic acid) provides directions for its own replication.
A gene provides the directions to build a molecule of RNA.
A polynucleotide has a repeating sugar-phosphate backbone.
The structure of DNA is a double helix molecule, whereas RNA usually consists of a single polynucleotide strand.
Learn more about DNA here:
brainly.com/question/1328358
An element is a pure substance that cannot be broken down by a chemical reaction.
