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2 years ago

Explain how iron band formations are evidence for the evolution of Earth’s atmosphere.

Biology

1 answer:

Marizza181 [45]2 years ago

7 0

Answer:

Photosynthetic organisms were making oxygen, but it reacted with the iron dissolved in seawater to form iron oxide minerals on the ocean floor, creating banded iron formations. ... The oxygen that is now in the Earth's atmosphere was not there at the beginning.

Explanation:

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Two plates moving towards each other are called convergent plates. Which

AysviL [449]

C: Mountains.

Explanation: The two plates collide and push up against each other, forming the mountains

6 0

2 years ago

In an ionic compound, the attraction between actions and _________ hold the compound together

Nady [450]

Answer:
The correct option in blank is anion.

Explanation:
Ionic compound is formed by the transfer of electron from one atom to another atom. When an electropositve atom lose an electron it form cation, whereas as anion is formed when an atom gain an electron. These actions and anions then attract each other and form an ionic compound.
I hope it will help you.

Example:
The formation of NaCl is best example of ionic compound. Na has one electron in its outer most shell which can easily be removed to form Na+, while Cl has seven electron in its outer most shell so it can easily gain an electron lost by Na to form Cl-. Then these ions attract each other and form NaCl as shown in the figure.

3 0

2 years ago

Which stains are used to visualize structures in the bacterial cell wall

Alika [10]

Answer: Acid-fast and Gram

Explanation:

The gram stains peptidoglycan and the acid-fast stain stains mycolic acid, which are both in the cell wall.

7 0

2 years ago

If a cell with 36 chromosomes undergoes mitosis, how many cells will be produced and how many chromosomes

ELEN [110]

Answer:

B. There will be two cells each with 36 chromosomes.

Explanation:

The products of mitosis are called diploid cells, and they each have the complete set of chromosomes. These cells are usually important for activities such as growth, repair etc. They make up our normal body (somatic) cells. Therefore, the answer is 36, only 36 matches the description of genetically identical cells

6 0

2 years ago

The CNS is vulnerable. There are several systems and structures in place which protect these vital tissues. How is the brain and

V125BC [204]

Answer:

1) Skull and Vertebral column

2) Meninges

3) Cerebrospinal fluid.

Explanation:

Central Nervous system:

CNS is the abbreviation of Central Nervous system. CNS controls the whole body functions so it is the most important component of the body. CNS consist of two parts 1) Brain and 2) Spinal cord

Both of these organs are very important and hence need to be protected. Nature provided these organs with certain protective mechanisms these includes

1) Skull and Vertebral column:

Skull is present around brain and vertebral column is present around spinal cord. These structure provides mechanical support to soft parts of CNS.

2) Meninges:

These are the membranes that provide antiseptic environment to the brain and hence protect it from microbes and other harmful substances.

3) Cerebrospinal fluid:

This fluid is present inside meninges which nourishes the brain and protect it from mechanical stresses.

5 0

3 years ago