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Mkey [24]
3 years ago
13

I need help.... on this ​

Biology
1 answer:
ch4aika [34]3 years ago
3 0
The last one I think
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Explain the phenomenon of photorespiration, including why it is thought to occur (evolutionarily speaking), and why plants have
liubo4ka [24]

Photorespiration limits casualty products of light reactions that build up in the absence of the Calvin cycle. In many plants, photorespiration is a problem because on a hot, dry day it can drain as much as 50% of the carbon fixed by the Calvin cycle.  The closing of stomata reduces access to CO2 and causes O2 to build up. These conditions favor a seemingly not useful process called photorespiration.  In most plants (C3 plants), initial fixation of CO2, via rubisco, forms a three-carbon compound.  In photorespiration, rubisco adds O2 instead of CO2 in the Calvin cycle. Photorespiration eats up O2 and organic fuel and releases CO2 without producing ATP or sugar. Photorespiration can evolve relic because rubisco first evolved at a time when the atmosphere had far less O2 and more CO2. 

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For guinea pigs, short fur (F) is dominant over long fur (f)cross a heterozygous parent with a homozygous recessive parent. What
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50% of them will have long fur
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Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) are
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E. produced in both male and female humans
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LH triggers ovulation in females and helps produce testosterone in males.
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What is one way that micro organisms can be harmful to humans?
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Microbes cause infectious diseases such as flu and measles.

https://microbiologyonline.org/about-microbiology/microbes-and-the-human-body/microbes-and-disease

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Read 2 more answers
Why is an ecosystem never constant?
SVEN [57.7K]
Lots of factors play different kinds of roles on ecosystems.
Ecosystems are never constant because there are so many levels and layers of animals to each one. It's impossible for the headcount of each species to stay the same within an ecosystem when instances such as flooding, drought, poisoning, and hunting can take part. 
Let's say the hawk, who is over the bunny on the pyramid, gets poisoned by water. Now, there's fewer hawks, which means there's less predators to hunt the bunnies, hence causing more bunnies and even increasing the chance of overpopulation. 
The animals within ecosystems keep each other in check, but numbers are constantly going up and down as things happen. Natural disasters, pollution, and anything such as, effects the ecosystem, therefore it cannot remain constant. 
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