A) The DNA base sequence changes permanently.
Answer: In genetic term, evolution can be defined as any change in the frequency of allele in a population over a period of time.
Natural selection usually brings about changes in the genetic variation of a population of organisms over a period of time, this process might lead to speciation, which is formation of a new specie that is distinctly different from those that had been existing before. Genetic evolution through natural selection usually enhance an organism's ability to survive' in its environment.
Answer:
- The ability to fly
- The quinine exoskeleton
Explanation:
The reason why insects are so successful in diversifying and adapting to different environments is closely related to their morphological and physiological adaptations.
In general, and compared with other groups, insects are small-sized. This characteristic also turns to be important and advantageous. Being small helps them find refuge in any place, escaping from predators, and as they are small they do not need too much food to survive.
Insects have a light and resistant exoskeleton made of chitin, a nitrogenated polysaccharide. This structure turns to be very important because it is impermeable to water, which helps the insect to avoid dehydration, helping the invertebrate to inhabit many different kinds of habitats. Also, the exoskeleton protects the arthropod from toxic substances and their natural enemies attacks, such as predators and pathogens
Insects are the only invertebrate with wings. Flying capacity is probably the most important adaptation that helped insects in their dispersion process to new areas. Being able to fly allows them to move huge distances looking for food, refuge, or mate. However, during evolution, some groups have lost the wings or have reduced their flying capacity.
The short life cycles, and their numerous litters, also helped them in their diversifying process.
<span>This is the descending pathway. These are the neurons that allow for lower motor neurons to activate movement in the appropriate areas. These are fairly long neurons, having no synapses until they reach the lower neurons in the spinal cord.</span>
A compound is always a substance because it's made out of two or more atoms bonded together. Now a substance isn't always a compound because it takes two or more elements to create a compound in a chemical reaction, ans substances can contain only one element. In other words a substance can be constructed of one type of atom. Some substances that aren't compounds are: gold and baking soda.