The introduction of zebra mussels in the Great Lakes is an example of <u>accidental</u> release from ballast water in a foreign container ship.
diploid containing two complete sets of chromosomes and haploid has a single set of unpaired chromosomes.
Here are the 8 steps of meiosis:
<span>1. Each chromosome makes an identical copy of itself, forming two exact halves called chromatids. The chromosomes then thicken and shorten into a form that is visible under a microscope. The nuclear membrane disappears. </span>
<span>2. Each chromosome is now made up of two chromatids, the original and an exact copy. Similar chromosomes pair with one another, forming homologous chromosome pairs. The paired homologous chromosomes line up at the equator of the cell. </span>
<span>3. The chromosomes separate from their homologous partners and move to opposite ends of the cell. </span>
<span>4. The nuclear membrane reforms and the cell divides. The paired chromatids are still joined. </span>
<span>5. Each cell contains one member of each homologous chromosome pair. The chromosomes are not copied again between the two cell divisions. </span>
<span>6. The chromosomes line up at the equator of the cell. </span>
<span>7. The chromatids pull apart and move to opposite ends of the cell. The nuclear membrane forms around the separated chromosomes, and the cell divide. </span>
<span>8. THE RESULT: Four new cells have formed from the original single cell. Each new cell has half the number of chromosomes present in the original cell.</span>
Answer:
The correct answer is option - A. 0.
Explanation:
Producers are the organism that produces on their own. They do not depend on other organisms for their nutrition and energy such as green plants. They transfer energy and nutrition.
In the given scenario there is no producer present all are consumers of different levels. Cricket is a primary consumer, a spider is a secondary consumer and bird is the third consumer in this food chain.
Thus, the correct answer is option- A. 0.
