Answer:
High mass stars have to generate a lot of energy in order to balance the force of gravity. Therefore they are very hot and luminous. That explains their position high on the Main Sequence. On the other hand, low mass stars have to generate little energy in order to balance the force due to gravity.
Answer: Biological Test Biological tests are frequently used to validate the physical and chemical tools or to provide complementary evidence about bioavailability process in a system. From: Chemosphere, 2017
Explanation:
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Answer:
There are four steps in secondary Succession.
1.
1st year after forest fire, flood, or farmer abandons a field: Weeds grow,
usually crabgrass.
2.
2nd year: Seeds blown in or carried in by animals become new weedy
plants, such as horse-weed.
3.
5 to 15 years: Small pines begin growing in the area, gradually become a
pine forest
4.
As older pines die hardwoods succeed them if the climate supports them.
Explanation:
Mechanical digestions is usually associated with the mouth. You mechanically chew the food and saliva breaks it down. Chemical digestion occurs in the stomach where stomach acid breaks it down.
Cells at the completion of meiosis compare with cells that are in prophase of meiosis I is (A) The cells have half the number of chromosomes and half the amount of DNA.
The correct option is (A).
- The cells produced at the end of meosis cell division have half the number of chromosomes (termed as Haploid), so they will have half the number of chromosomes but same DNA as that of the parent cell as DNA divides and makes a copy of the parent cell DNA.
- Meiosis is a form of cell division of germ cells that creates gametes such as sperm or egg cells in sexually reproducing animals. It consists of two rounds of division that result in four cells with just one copy of each chromosome (haploid). Prior to division, genetic material from the paternal and maternal copies of each chromosome is crossed across, resulting in novel code combinations on each chromosome.
- During fertilisation, the haploid cells generated by meiosis from a male and female will unite to form a zygote, a cell with two copies of each chromosome.
To learn more about Meiosis.
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