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Misha Larkins [42]
3 years ago
8

How are prokaryotes useful to our world? Provide one example

Biology
1 answer:
Nataliya [291]3 years ago
7 0
They train our immune system so it's ready when our bodies are attacked, and they aid in digestion and supply us with vitamins. ... Scientists and doctors can even utilize prokaryotes to help the human body.
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Why aren't there many large carnivores?
Anika [276]

Answer:

Technically, the largest ever marine predator known thus far - the blue whale - is, for now, alive and well, but I know what you mean. You’re not talking about filter-feeders, or fish-eaters, you mean macropredators.

The last truly enormous macropredator in our oceans was probably Carcharocles megalodon, which went extinct about 3.6 million years ago. Other recent examples include the terrifying sperm whale Livyatan melvillei (which disappeared 8.9 mya) and other megatoothed sharks like C. chubutensis.

So, why did the giants go away? The answer, in truth, is likely multi-faceted. Here are some major promising hypotheses, or at least contributing factors:

Whales have declined. Giant sea carnivores like C. megalodon and Livyatan relied on marine mammals - specifically baleen whales. During the Pliocene, the Americas connected and the Central American Seaway was closed. This seems to have triggered a significant decline in the diversity of tropical whales, and would thus limit food availability for huge, energy-hungry predators.

Things got too cold. The extinction of megalodon and other giant ocean predators roughly coincides with the trend of decreasing temperatures the Pliocene brought. Giant sharks in particular, not being fully warm-blooded, would suffer from this, and it would also mean a decline in food supply. You can even see a sudden cold snap just about when Carcharocles went extinct, 3.6 mya.

Smaller predators outcompeted them. The niche of Carcharocles and the macroraptorial sperm whales is arguably still filled today - by the killer whale. Many orca pods specialize in hunting whales or other marine mammals. However, killer whales and their ancestors were perhaps more opportunistic, fast, intelligent and indeed adaptable than the massive, solitary hunters.

Ironically, the largest ever marine predator owes its existence to the demise of the largest ever marine macropredators. Since the extinction of macroraptorial sperm whales and Carcharocles megalodon, baleen whales have been gradually increasing in size, for they no longer need to be as fast and agile. Because of this, we have the privilege of sharing our world with the largest animal known to have ever lived - the blue whale.

8 0
3 years ago
Scientific theories can change over time as new information is discovered if I lose scientific theory changes does this mean tha
Mashcka [7]
No. It was an idea that yielded common positive results. “Not a good theory” is biased terminology. New technology can yield new information, but it does not mean that it was not a good theory.
3 0
3 years ago
can the behavior of a material or substance be considered a physical property? Explain why or why not. ​
mestny [16]

Answer:

yup it can be considered as the physical property like as if the solid is hard it can hurt to so it has the property of being hard and behavior of being hurted

4 0
3 years ago
Houses have been built around a small retention pond, increasing the fertilizer runoff into the pond. This has led to algal bloo
olchik [2.2K]

Answer:

The answer is D. I hope this was helpful!

Explanation:

5 0
3 years ago
Glucose and oxygen are products.<br><br> Photosynthesis<br> Respiration<br> Both
Lyrx [107]

Answer:

Photosynthesis

Explanation:

In photosynthesis, carbon reduction helps make glucose, the oxygen is formed with the reduction of water in the photosystems 2 and 1.

In cellular respiration, both of these compounds would be reactants.

3 0
3 years ago
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