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abruzzese [7]
3 years ago
10

HELP ME PLEASE I BEG YOU I RELLY NEED IT URGENT !!!! 15 points!

Biology
1 answer:
levacccp [35]3 years ago
5 0
The easiest example here is a computer/laptop... e.g. when the CD-ROM is spinning when you are perhaps playing a movie, the kinetic energy causes friction, which results in heat.  All computers need a fan to prevent them over-heating for this very reason.  Therefore heat is lost and energy is wasted.

Another example is a lightbulb.  When a light is switched on and left for a long time, the current flowing through the filament (the thin bit of wire in the bulb) causes heating (due to electron-ion collisions but you may not need to know that) so energy is wasted as thermal energy instead of light energy.

These are just a few examples but other ones you could use are tv screens, kettles, toasters, etc :)
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If there was complete (100%) selection against an uncommon deleterious recessive genotype (aa) in the human population, would yo
Lady_Fox [76]

Answer:

Explanation:

Selection is used in identifying some important traits for improving on or elimination.

Selection against is when a selection does not favour a particular allele. If recessive allele is selected against there will be a reduction in the frequency of the allele.

Since it was complete selection against the frequency of the allele will move from its level of fitness to zero and the allele of the gene will be lost completely in the genome of the organism.

natural selection i.e selection done by nature is not enough to get 100% selection against because of the allele reoccuring in heterozygous form but with artificial selection by man it is achievable.

3 0
4 years ago
If there are 10 chromosomes in a particular cell at the start of prophase how many will be present in the same cell at the end o
Ilia_Sergeevich [38]

Answer:

20 chromosomes

Explanation:

Mitosis is a kind of cell division that results in daughter cells with same number of chromosomes as the parent cell. It involves stages including Prophase, Metaphase, Anaphase and Telophase. In prophase, the Chromatin condenses into Chromosomes.

In Anaphase stage, the 10 chromosomes as mentioned in the question divides into opposite poles of the cell. One individual chromosome contains two sister chromatids, which actually separates in the Anaphase stage. Hence, at the end of the Anaphase stage, there will be 10 chromatids each at opposite poles of the cell. Each chromatid at this stage is considered a chromosome.

Hence, a cell with 10 chromosomes will contain 20 chromosomes (10+10 chromatids on each pole) in the Anaphase stage just before the cell divides into two in a process called CYTOKINESIS.

4 0
3 years ago
Plz help with 8 and 9
ioda
Some of the tools that scientist might use to study a sinkhole first of all is some of there five scenes like using there eyes to observe rock and soil they might use there nose to pick up gaseous orders and there ears to hear how the earth shifts
8 0
3 years ago
After six hours the plants were frozen in liquid nitrogen, before being put onto photographic
Rzqust [24]

Explanation: I suggest:  A freeze occurs when the temperature drops below 32 degrees, and frost can happen when the air temperature (which is measured about six feet above the ground) is up to about 36 degrees. If part of your yard is lower than the rest, it’ll probably be coldest there since cold air is heavier and sinks down.

6 0
3 years ago
Diarrhoea definition​
ZanzabumX [31]

Answer:

A condition in which feces are discharged from the bowels frequently and in a liquid form.

Explanation:

Hope this helps and have a wonderful day!!!

3 0
4 years ago
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