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Archy [21]
3 years ago
7

Calcium sulfide forms when calcium loses 2 valence electrons to sulfur. What type of a bond is formed? covalent ionic

Biology
1 answer:
il63 [147K]3 years ago
4 0
A covalent bond is formed
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Nitella [24]

Answer:

how can I help u.........

7 0
3 years ago
What can be inferred about a petrified log? the wood needed long ages before it could petrify the tree laid on the surface for l
RideAnS [48]

Answer:

the petrified log looks like the original tree.

Explanation:

A tree to be petrified first needs to be buried. An element laying on the surface can not be petrified because it is exposed to many different factors (such as<em> organisms, microorganisms, climatic conditions</em>, etc.), that affect the petrification process. So, in the case of a fallen tree, first, it needs to be covered by many sedimentary layers. Once it is underground, it also needs the presence of underground water and minerals. Water replaces the original organic material with minerals (silica, calcite, and pyrite). This replacement process results in the conversion of the woody material into a fossil of the original material. Very often, the tree details are so preserved that the fossil looks exactly like the original trunk.

Depending on the preservation degree, a fossil can be useful for different studies about the past.

6 0
3 years ago
Why is adult stem cell research less controversial than embryonic stem cell research?
jok3333 [9.3K]

。☆✼★ ━━━━━━━━━━━━━━  ☾

The correct option would be B. consent can be obtained from adult stem cell donors.

The controversy behind the other option is that it is a form of life, but no consent is taken from the actual life. (i know it's phrased weirdly, my bad)

Have A Nice Day ❤  

Stay Brainly! ヅ  

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。☆✼★ ━━━━━━━━━━━━━━  ☾

7 0
3 years ago
Read 2 more answers
Researchers have noticed that some men who were sterile because their sperm cells were unable to move also had chronic infection
zimovet [89]

Answer:

Kartegener's disorder

Explanation:

The respiratory tract has cilia which move. Sperms also have a tail that moves. They both have the same protein in their structure called microtubules. There is a disorder in which there is the absence of a part in the microtubule. Dynein arms absent in microtubules. Because the respiratory system and sperm both contain cilia that's why these two systems have a connection and not work properly.

4 0
3 years ago
Use the following terms to describe in detail how you visually perceive an object that you can see right now. Use the terms in o
irina1246 [14]
Use the following terms to describe in detail how you visually perceive an object that you can see right now.

Answer: To see for example an apple first light that passes through the pupil is eventually reflected on the pupil, activating neurons in the retina. light waves that were reflected off the apple are changed into neural impulses (transduction) at the point of the retina, where neurons fire in response to light waves. Action potentials are released when neurons fire, sending an electrical charge through the neuron. Excitatory neurotransmitters are released when the action potential reaches the axon terminal, and that these neurotransmitters increase the chances that the next neuron will fire. Of course the neural message from the retina first passes through the thalamus, and then the thalamus routes the impulse elsewhere in the brain.

I hope it helps, Regards.
5 0
3 years ago
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