Most energy in an ecosystem comes originally from _____. plants primary consumers the Sun the soil

A ________ is a membrane-bound sac found in cells that contains digestive enzymes which break down complex molecules or structur

Brut [27]

The answer is lysosome :)

6 0

3 years ago

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List three changes of state during which energy is absorbed.

mote1985 [20]

The three changes of state during which energy is absorbed are:

1. Change from solid to liquid - Melting.

2. Change from liquid to gas - Vaporization

3. Change from solid to gas - Sublimation

All these changes of state require heat energy to break the attractive forces that hold the particles of the molecules together, so that they can move into more disorderly states. For instance, when heat is applied to a solid, the solid absorbs the heat and use it to break the attractive forces that are holding the molecules of the solid together. At a particular temperature, the attractive forces will be completely overcome and the solid framework will collapse, thus leading to the melting of the solid.

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3 years ago

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The death of an organism due to starvation would be an example of? A) artificial selection. B) natural selection. C) secondary s

andrew-mc [135]

Answer:

A

Explanation:

As it is caused by human intervention and doesn't occur naturally.

8 0

3 years ago

Why do biologists measure the number of trophic levels in an ecosystem?

slega [8]

Answer:

Biologists measure the number of trophic levels in an ecosystem so as to check its stability and health.

Explanation:

Trophic levels are the feeding position in a food chain such as primary producers, consumers, etc. They are positions that an organisms occupies in a food chain (series of steps in which organisms transfer energy by eating or being eaten);- what it eats and what eats it.

Theoretically there is no any limit to the number of trophic levels in a food chain or number of organisms that live on each level.

3 0

3 years ago

Where do most of the world's coal mines come from?

Sonja [21]

Answer:

Most of the world's coal mines come from China, India, the United States, the European Union, and Australia.

Explanation:

China: In the year 2018, China alone produced approximately 3523 million tonnes of coal. Though China is the largest producer of coal in the world, it has to import coal from other countries to fulfill its energy needs. China's share in the total coal produced in the world in the last 12 years is 39.7%.
India: The production of coal in India reached approximately 716 million tonnes in the year 2018. The total amount of coal produced in India in the last 12 years makes up 7.5% of the coal produced all over the world.
The United States: The coal produced in the United States in the year 2018 was approximately 702 million tonnes. The last 12 year share of the coal produced in the US is 16.2% of the total coal produced all over the world.
The European Union: The countries that constitute the European Union togetherly produced approximately 490 million tonnes of coal in the year 2018. The last 12-year contribution of the EU to the total coal produced in the world is 9.2%.
Australia: The production of coal in Australia for the year 2018 was approximately 481 million tonnes. Australia alone produced 6.2% coal of the total world production of coal in the last 12 years.

6 0

3 years ago