In a lake ecosystem, sunlight that reaches the water helps green algae grow in and on the water, as in the picture shown below.

Algae produce oxygen. Tiny animals that live in the water eat the algae. Small fish eat the tiny animals, absorb oxygen with their gills, and give off carbon dioxide as waste. Plants use the carbon dioxide to grow.

Which of the following would happen if the algae disappeared?
The tiny animals would not have enough food.
Fish would not have enough oxygen.
Plants would lose some of the carbon dioxide they need to grow.

theirs more than one right answer

1) The tiny animals would not have enough food.

2) Fish would not have enough oxygen.

Explanation:

If algae is removed from the marine ecosystem, all the ecosystem will be disturbed because algae are the producer which produces two materials i. e. oxygen and food for tiny organisms. If algae are removed, tiny animals die because of hunger. Oxygen concentration is also lower when algae is removed from the ecosystem and this decrease in oxygen concentration causes suffocation and the fishes are die.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.