Answer:
The answer is B
Explanation:
More dense liquids will want to flow further down. They have a higher weight per volume, allowing them to "Push past" the other liquids. Italian Dressing is a great example (when given time, the oil will be at the top because it is less dense then the water and other seasonings.
Sexual reproduction produces genetically different offsprings which do possess variations, hence better chance to survive in the environment.
Option C
<h3><u>Explanation:</u></h3>
Sexual reproduction is the process of reproduction where there's a fusion of gametes from a male and female of the same species, resulting in a zygote and eventually an offspring. Sexual reproduction is very advanced type of reproduction which is very expensive for an organism. Much of the energy of the organism is spent to produce gametes and other necessary processes for reproduction.
Gametes of the sexual reproduction is produced mainly by means of meiotic cell division. This involves crossing over and chaismata formation which helps in genetic variations in the offspring. These variations help the species to survive unknown changes in environment, and helps to adapt quickly lessening the chances of extinction. So sexual reproduction has modified various times in different groups of species.
Answer:
I and III only
Explanation:
Crop rotation is a farm practice that involves cultivating different species of crops on the same land at different seasons. In other words, the different crops are rotated. Crop rotation is done for various reasons including; improvement of soil fertility, pest and disease control etc.
In this case, a crop rotation of various grains and legumes would be an appropriate solution for the following problems:
- The nutrients in the soil on a farm are being depleted: Legumes are known to be rich in nitrogen and hence add nitrogen to the soil due to the nitrogen-fixing microbes in their roots. Hence, rotating between grains and legumes can help return the depleted nutrients (by grains) to the soil.
- A particular kind of pest is infesting the soil on a farm: Most pests are usually crop-specific, hence, planting only one type of crop can make that soil be infested with a particular kind of pest. However, rotating between crops such as grains and legumes can make a particular pests become scarce or less populated.
It conveys emotions or moods.
Answer:
d They usually have certain special functions
Explanation:
a) They can all turn into the same kind of cell needed - this is false. Cells in a multi cell organism such as humans cannot turn to any type of cell, this functionality is called pluripotency, and only exists in specialised cells called stem cells. These cells are present early in development, and in some tissues where cells are replaced frequently, like the cells of the gut.
b) They are all identical - this is false. Although they all carry the same genetic information, the cells in a multicell organism are usually very different, carrying out different functions. E.g. the cells of the skin are very different from the cells of the blood.
c) They are prokaryotic cells - this is false. All prokaryotic cells are single celled organisms, only eukaryotic cells can form part of multi cell organisms
d) They usually have certain special functions - this is true. Cells in a multicell organism usually perform different functions in order to contribute to the entire organism. For example, the function of the cells in the heart is very different from the function of the cells in the brain.
