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3 years ago

Facts and opinions about the ocean

Biology

1 answer:

iren [92.7K]3 years ago

7 0

Answer: Our oceans cover more than 70 per cent of the Earth's surface.

The majority of life on Earth is aquatic.

Less than five per cent of the planet's oceans have been explored.

The world's longest mountain chain is underwater.

There are more historic artefacts under the sea than in all of the world's museums.

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_______ hazards are substances derived from organisms that pose a threat to the health of humans, animals and/or plants.

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Biological hazards are substances that pose a threat to living things.

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When observing flagella distribution patterns, bacteria with a single flagellum at each pole are called ________________ bacteri

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Amphitrichous....they have a single flagellum from both ends.

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As organisms become more complex and increase in size they develop a need for a

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Recently work in evolution theory has proposed that by relaxing selection pressure, which typically acts to streamline genomes, the complexity of an organism increases by a process called constructive neutral evolution.

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3 years ago

A 20-pound object is dropped from a 50-foot bridge onto the ground below it. A 50-pound object is dropped from a 100-foot cliff

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The 50 pound object will reach the ground first.

Explanation:

Using the second equation of motion, we can derive the time taken for each of the object to reach the ground. As the object is thrown from the top of the bridge or cliff, acceleration due to gravity will be acting on them.

So, $s = ut+\frac{1}{2} at^{2}$

The value of s for the object thrown from 50 foot bridge is given as 50 ft. The initial velocity of the object will be zero. The acceleration can be written as the ratio of mass to gravitational force.

Then, $s = (0) t +\frac{1}{2}*\frac{m}{F}*t^{2}$

$50 = \frac{20}{2F} t^{2} \\\\t^{2} = \frac{100F}{20}$

$t = \sqrt{5F}$

Then, consider the time taken for the 50 pound object to reach the bottom of 100 ft cliff as t₁ and the displacement in this case is 100 ft.

Then, $100 = (0)t +\frac{1}{2}*\frac{50}{F}*t_{1}^{2} \\\\t_{1}^{2} =\frac{200F}{50}$

$t_{1} = 2 \sqrt{F}$

Since, the gravitational force acting on both the objects will be same, the ratio of time taken is

$\frac{t }{t_{1} }=\frac{\sqrt{5F} }{2\sqrt{F}} = \frac{\sqrt{5} }{2}$

So, the time taken for the 20 pound object to reach the ground of 50 ft bridge is √5 s =2.236 s and the time taken for the 50 pound object to reach the ground of 100 ft cliff is 2 s.

Thus, the 50 pound object will reach the ground first.

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3 years ago

Based on the graph, determine how many total meters the falls eroded from 1900 until 1910

posledela

Answer: 9.3 meters

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Facts and opinions about the ocean ​

Facts and opinions about the ocean