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Readme [11.4K]
3 years ago
15

Which of the following best describes bases?

Biology
1 answer:
lidiya [134]3 years ago
8 0

Answer:

They turn <em>moist</em><em> </em><em>red</em><em> </em><em>litmus</em><em> </em><em>paper</em><em> </em><em>blue</em> and they react with metals.

They turn moist red litmus paper blue because they have a pH range of 8-14, hence they are indicated by a blue colour of the litmus.

They react with metals because they are reactive, the reaction forms a metal salt and water.

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The Great Oxygen Event marks the time, approximately 2.5 billion years ago, when ________.
Leokris [45]

Answer :There was enough oxygen in the atmosphere to support a major burst of life on Earth

Explanation:

The Great Oxygen Event marks the time, approximately 2.5 billion years ago, when there was enough oxygen in the atmosphere to support a major burst of life on Earth

For the first half of the Earht's history, there was no oxygen in the atmosphere. It was inhabited only by single-celled organisms.Of  those simple life forms, the cyanobacteria may have. evolved a way to take energy from sunlight, and used it to make sugars out of water and carbon dioxide. They used the same chemical process we know as photosynthesis. This released vast quantities of oxygen into the atmosphere and  triggered the evolution of complex life.

3 0
3 years ago
The first step in treating drinking water, called ____________________, involves passing water through a series of screens.
AlekseyPX

The right answer is Filtration.

A water filter is composed of a filtration system that aims to separate the water from the solid particles (residues) by passing it through a porous medium, which allows only the liquids and the finer solid particles to pass through. as the filter holes (porosity). The water that comes out of this filtration system is rid of solid particles larger than the pores of the filter.

Some water filters are designed to make drinking water (very fine filtration, less than the size of a microbe).

6 0
3 years ago
Which type of mutation cannot occur in a child after birth?​
Lera25 [3.4K]

Answer:

Somatic Mutation

4 0
3 years ago
Read 2 more answers
What are the cells that are primarily responsible for photosynthesis?
4vir4ik [10]

Answer: thylakoid membrane

Explanation:

8 0
4 years ago
Read 2 more answers
Do you know any clever ways to repurpose leftover banana peels?
baherus [9]
Blend the banana peels with coffe grounds and egg shells to make a homemade fertilizer!
5 0
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