Explanation:
The products in a reaction are the species on the right hand side of a chemical equation.
The reactants are the species on the left hand side of the equation.
A + B ⇒ C+ D
The reactants A and B, products are C and D.
Reactants are the species combining together.
The products are the results of the combination.
Types of chemical reactions;
Combination or synthesis; in this type of reaction, two species combines to give a product or products:
A + B ⇒ C+ D
Decomposition or cracking: a specie breaks down into one or more products:
A ⇒ B + C
Single displacement: one specie replaces another in a reaction:
A + CD ⇒ AC + D
Double displacement: species replaces another in a reaction:
AC + BD ⇒ AD + BC
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Answer:
Failure of chromosome to separate
Explanation:
The main essence of meiotic division is to form daughter cells with a reduced number of chromosomes that will maintain the correct chromosomal number in an organism. This is achieved when chromosomes separate during gamete formation (meiosis) to produce haploid (n) gametes.
However, a case may arise whereby chromosomes fail to separate during the anaphase stage of meiosis. This case is referred to as MEIOTIC NON-DISJUNCTION. As meiosis occurs in two stages i.e. meiosis I and II, so does meiotic nondisjunction. It can occur in meiosis I, where homologous chromosomes fail to separate or meiosis II, where sister chromatids fail to separate.
If it occurs in meiosis I, Two gametes will have a n-1 chromosome number i.e. one chromosome is missing while Two other gametes will have n+1 chromosome number i.e. one extra chromosome is added.
If it occurs in meiosis II, two normal haploid gametes (n) will be produced while the other two will have a n+1 and n-1 chromosome number respectively.
When these abnormal gametes (n+1, n-1) fuses with a normal gamete (n), the resulting organisms possess a chromosomal anomaly called ANEUPLOIDY i.e. a disorder in chromosomal number. The organisms will have 47 and 45 chromosomes depending on whether n+1 or n-1 gametes is involved respectively.
Answer:
The answer is: After step 3, layers of sediment cover the dead organism.
Explanation:
Fossilization is the process by which living things are preserved as impressions on sedimentary rock (fossils). This is a rare process that occurs under the most appropriate conditions.
Process of Fossilization:
Permineralization is one of the most common types of fossilization. It involves the absorption of minerals into the remains, giving a detailed impression of the dead organism.
- The dead organism sink to the bottom of the ocean.
- The soft parts i.e. the tissue is decomposed whereas the hard parts of the body: the nails, bones and hair remain.
- The bones are gradually covered by sediments. The quality of the fossils often depends upon the type and quantity of sediment. River deltas have a large amount of sediment. This speeds up the process. Clay and mud sediments provide more detail to the fossil whereas sandy sediments render the details vague.
- Sedimentation is followed by permineralization. As layers of sediment accumulate over each other, the layers underneath turn to rock. This occurs due to the movement of minerals down to the seabed that harden the sediments. Minerals such as calcite may even replace the bones and other hard parts of the fossil, allowing it to remain preserved for long.
- The fossils discovered by archaeologists are present relatively closer to the surface of the Earth. This occurs due to the uplifting of rock layers due to the movement of the continental plates.
In general, a balanced diet contains relatively even amounts of carbohydrates, proteins, and lipids. Too much sugar (monosaccharides and other simple sugars) is unhealthy. Fruits and vegetables are importante sources of vitamins and minerals.
<h3>Do you consider your diet balanced and healthy? Why or why not?</h3>
I consider that the diet I follow is a balanced diet since I include in it greater amounts of healthy foods such as rice, beans, meats, fruits and vegetables than processed foods. My diet is focused on feeling good and this means that the meals I eat are healthy and make me feel good.
All of this is accompanied by <em>daily exercise, good sleep and consumption of multivitamins</em> to feel good and carry out my daily tasks in the best way.
Therefore, we can confirm that following a diet like the one narrated is a good way to have a balanced diet and a healthy way of life.
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