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pentagon [3]
3 years ago
6

How does calcium form an ion?

Biology
2 answers:
Ludmilka [50]3 years ago
8 0

Answer: Some atoms gain or lose more than 1 electron. Calcium loses 2 electrons when it becomes an ion. When ions come together to form an ionic bond, they always join in numbers that exactly cancel out the positive and negative charge.

Explanation:

That's it.

dmitriy555 [2]3 years ago
7 0

Answer: By losing its two outermost electron

Explanation:

Calcium is a element that belongs to group 2 in the periodic table. It has an atomic number of 20, and an electronic configuration of 2, 8, 8, 2.

Hence, to form an octet structure, it gives off its two electrons as shown below:

Ca <----> Ca2+ + 2e-

Thus, by losing its two outermost electrons, a positively charged calcium ion (Ca2+) is formed

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vfiekz [6]

Answer:

Opossums eat at night and eat mostly plants.

Explanation:

5 0
2 years ago
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Segmentation in the annelid worms has facilitated locomotion and specialization of different parts of these animals. Evaluate th
Citrus2011 [14]

Answer:

a. Excretion is accomplished by paired protonephridia with flame cells in every segment of the body. True

Most anelids have structures called metanephrids or protonephridia. Both structures are homologous to the kidneys and have the function of excresion, A pair are present in every segment of the body.

b. If the organs in one segment fail, the organs of another segment will still function. False

It is false because all segments are interrelated and have different functions depending on their location.For example, the first segment is where the sensory appendages are, such as the antennae and the eyes. The second segment is where the mouth is. There are a series of parapod segments to move, collectively called metameres and ends in a terminal portion called pigidium, where the anus is located.

c. Annelids possess both circular and longitudinal muscles that produce waves of contraction that are propagated down through the points eBookseries of segments.True

True because anelids have circular and longitudinal muscles that serve to function the hydrostatic skeleton.

d. Segmentation has allowed for specialization in the anterior of the annelid body, which has provided for a more sophisticated nervous system. True

True because the segmentation allows to have a nervous system formed by a ventral nerve cord provided with ganglia and lateral nerves in each segment.

5 0
3 years ago
Louis pasteur made several major contributions to microscopy. which was a discovery or invention made by someone other than past
Levart [38]

The contribution to the development of the microscope that was made by someone other than Louis Pasteur was the discovery of the light microscope by Robert Hooke.

<h3>What is microcopy?</h3>

The term microscope refers to an equipment that could be used to study cells that can not be seen with the optical eyes. The range of the structures that could be seen by the microscope are quite infinitesimal hence the microscope was instrumental  to the advancement of the cell theory.

The contribution to the development of the microscope that was made by someone other than Louis Pasteur was the discovery of the light microscope by Robert Hooke.

Learn more about microscope:brainly.com/question/18661784

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5 0
1 year ago
During a study testing a new screening tool for a chronic disease, an individual is screened for the disease and the test comes
katrin [286]

Answer:

False negative

Explanation:

  • If the test result comes out to be negative for a condition that is actually existing in reality, then such a test result is said to be false negative.
  • This means when the negative test result is incorrect, it can be called as a false negative.
  • Thus, the result would have been correct if the result would have come out to be positive.
  • In statistics false negative is considered as a type II error in which a test is conducted to check for a single condition and the result comes out to be negative even when the condition exists.
  • In the given situation, the person has a chronic disease but the screening test shows that the person does not have the disease and hence, this is an example of false negative.
7 0
4 years ago
What is the MAIN difference between primary and secondary succession?
tankabanditka [31]

Answer:

the answer is B because primary is when de breaking of rocks n secondary about the area

Explanation:

B

8 0
3 years ago
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