Answer:
Since there are many factors that can produce a mutation, the event that would be most likely to cause a mutation is a nucleotide is inserted into a DNA strand.
Explanation:
A genetic mutation involves an alteration of the DNA that leads to a defect in protein synthesis and a structural or functional alteration of an individual.
Of all the factors that can produce a mutation, the insertion of one or two nucleotides into the DNA strand produces a point mutation, or molecular mutation, of the insertion type.
<em> The other options are not correct because the processes of </em><em><u>mRNA traveling out of the nucleus</u></em><em>, </em><em><u>mRNA releasing from the DNA strand</u></em><em> or </em><em><u>enzymatic transcription of mRNA</u></em><em> in the nucleus can carry over a mutation produced in the DNA, but they are not mutation-producing factors.</em>
They change cause they want to change so leave them alone
Answer and explanation:
Plate tectonics is a scientific theory according to which all seven continents were together making a single supercontinent (Pangaea) 335 million years ago. However, the formation of convection cells within Earth (the molten material or magma) and with the help of gravity, the supercontinent started breaking apart at weaker zones. Eath broken parts or continents then started moving in different directions leading to continental drift.
The continental drift, later on, become the reason for the evolution of different plant species. Initially, all the plants and animals were living on single supercontinent but after plate tectonics, each continent started moving away from each other and so the climate conditions were also changing. Therefore, organisms living on the continents adapted themselves to a newer climate for their better survival. This lead to their evolution based on environmental conditions.
Charles Darwin observed fossils record for the organisms which belong to different continents but their morphological features were similar. He concluded that these organisms were the ancestors of modern species that became apart due to continental drift and adapted themselves to the new environment leading to their evolution and emerging as new species.
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Hey There!</h2><h2>
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Answer:</h2><h2>_____________________________________</h2>
Class Crustacea belongs to the Phylum Arthropoda. It is a class itself thus it does not have any subphylum.
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Phylums are the groups and Phylum arthropoda is one of the 33 phylas of the Kingdom Animalia. Phylum Arthropoda has the largest phylum of the Animal Kingdom with variety of animals that include one million species. It has 5 classes.
- Class Merostomata
- Class Arachnida
- Class Crustacea
- Class Myriapoda
- Class Insecta
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- They are usually aquatic both marine and freshwater.
- Exoskeleton is hard and made up of chitin called carapace.
- Body is divisible into head, thorax and abdomen. Some animals have cephalothorax.
- Cephalothorax regions are formed by the fusion of head and thorax
- Head bears two pairs of antenna, one pair of mandible, two compound eyes with stalk.
- Respiration takes place by gills or through body surface
- Excretion is carried out by one pair of antennary glands or green glands.
- The thorax and abdomenal appendages may be modified for swimming, feeding, walking, resperation as well as reproduction.
- Sexes are separate
- Dimorphism is prominent
- Five walking legs for locomotion are present.
- Example: 1)free living are, Daphnia, Cyclops, Argulus, Sacculina, Prawn Crabs etc.
2)Parasite are, Barnacles and Sacculina.
3) Marine are Shrimps, Lobsters etc.
4) Sedentary crustaceans are Barnacle(Parasite), Prawns(Fresh-water living) etc.
<h2>_____________________________________</h2><h2>Best Regards,</h2><h2>'Borz'</h2><h2 />
