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Dahasolnce [82]
3 years ago
9

What causes sun spots ?

Biology
2 answers:
larisa [96]3 years ago
8 0

Answer:They are caused by the Sun’s Magnetic field welling up to the photosphere

evablogger [386]3 years ago
6 0
The UV rays cause sun spots due to reaction from the radiation.
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Mutations have a positive effect on an organism
Katen [24]
Yes and no, without mutations, there would be no biodiversity, a lack of biodiversity results in vulnerability for excitation. Mutations can also be negative and debilitating for organisms. Without mutations, there would be no differentiation in the genetic pool.
6 0
4 years ago
Why HIV virus not spread by mosquito
muminat
Mosquitoes have a 6-tube system in their "snout". It's a big big needle with 6 parts to it. 4 of those parts are used to pierce the skin of the human. The other 2 parts are 2 tubes. One of those tubes sends saliva from the mosquito down into the human. The other sends blood up from the human into the mosquito.
Now, unlike some viruses (like dengue and Zikka), HIV cannot replicate inside a mosquito. HIV replicates inside human T-cells...there aren't any of those inside a mosquito gut. Eventually the HIV is destroyed and never makes it to the saliva of the mosquito - so the mosquito can never infect a human with HIV. 

3 0
3 years ago
Is it true that the struggle between organisms to survive in a habitat with limited resources called natural selection
OverLord2011 [107]

False. That is competiton, the stuggle between different species to survive with limited resources. Natural selection is when they organisms with traits that help them survive pass them (the traits) on through reproduction. This makes their valuable traits possible to rise in their offspring.
4 0
3 years ago
Which energy system can power an all-out effort from 3 to 10 seconds? oxygen atp-cp lactic acid nad
Anon25 [30]

The correct option is (b) ATP-CP.

ATP-CP stands for Adenosine Triphosphate Phosphocreatine.

<h3>What makes ATP and ATP CP different from one another?</h3>

ATP exhausts its energy after roughly 1-2 seconds. The high-energy links that hold the CP (creatine/phosphate) molecule together are utilised in subsequent studies. Energy is released when these bonds are broken. ATP is once more formed when the energy is used to rejoin the phosphate to ADP.

<h3>Why is ATP CP so important?</h3>

The ATP-PC system provides energy to the muscle fibers with the highest threshold, which can exert the maximum force. Larger, stronger muscles should have higher power because they can store more phosphocreatine.

Learn more about the ATP-CP with the help of the given link:

brainly.com/question/13533629

#SPJ4

6 0
1 year ago
Sharp leaves on the savanna trees protect them from _____.
Ghella [55]
Protects the plant from losing water. The sharp needles of the tree mean that is has less surface area for the sun to make contact. They may also have differently shaped stomata, in order to prevent water loss
7 0
3 years ago
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