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marusya05 [52]
3 years ago
9

Match the scientist to his contribution to the atomic theory.

Biology
1 answer:
Shalnov [3]3 years ago
3 0

Answer:

Explanation:

J. J. Thomson     Electrons are scattered within the atom.

J.J. Thomson carried out experiment on the discharge tube in 1897 which led to the discovery of electrons as a subatomic particle. During this time, the whole atom was thought to be made of only electrons.

John Dalton Atoms are the smallest unit of an element.

John Dalton in 1808 proposed that atoms are the smallest indivisible particles of an element.

Ernest Rutherford Protons are at the center of an atom.

In 1911, Ernest Rutherford performed experiments using gold foil. He discovered that an atom is made up of a massive center made up of positively charged particles called protons.

Niels Bohr Electrons are in orbital levels.

Bohr in 1913 suggested that electrons are in specific spherical orbits around the central nucleus.

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An age pyramid with a broad base that quickly slopes up to a narrow top would be indicative of ________.
kiruha [24]

Answer:

A. a developing nation

Explanation:

Age pyramids are the age structure diagrams that represent the number and proportion of people at each age in a population. The base of the age pyramids represents the population in pre-reproductive age which is from 0 to 10 years. The overall shape of an age pyramid indicates if the population is increasing, stationary, or shrinking.

The age structure diagram for a developing nation has a broad base that tapers quickly towards the top. This means that a larger percentage of the population is in the pre-reproductive age group and reproductive age group with a smaller percentage of the population in the post-reproductive age. These countries have a great chance of future population growth.

3 0
3 years ago
All matter has:<br><br> cells<br> properties<br> seeds
sergeinik [125]

Answer:

Properties for ALL MATTER

Explanation:

Cells can be found in ANYTHING, cells preform life functions for the organism, although you wont find cells in a rock, you will however, find properties in anything you come across, therefore properties is the right answer

6 0
2 years ago
genetics and the environment both play roles in cell differentiation. which is the best example of an environmental factor influ
In-s [12.5K]

Answer: etiolation of plant growth in shade, with fast growing cell without chloroplasts. Out of shade, cell differentiate again to produce photosynthesising cells

Explanation: It is a subjective decision as to what is ‘best’. Good examples are plant responses to changes in the nutrient supply.

when soil nitrogen is depleted some plants, such as legumes, grow nodules on their roots, with cells that release chemical signals to attract nitogen fixing bacteria.

Lack of light induces etiolation in many plants. New cells elongate and develop without chloroplasts, with rapid cell division exhibiting gravitropism, extending upward. When they grow beyond the shade area, cell differentiation changes again, to produce photosynthesising cells.

7 0
2 years ago
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Bingel [31]

Answer:

Explanation:

It includes epidermis and cork. Epidermis : It is usually present in the outermost layer of the plant body such as leaves, flowers, stem and roots. Epidermis is one cell thick and is covered with cuticle. Cuticle is a water proof layer of a waxy substance

4 0
2 years ago
Why are Medicinal Plants inportant? Don’t take any examples of each plants.
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Explanation:

They are natural as they are found in forests different trees and plants

no need for more money because if we can learn to use such herbs we can ourselves treat various kinds of small diseases like commn cold,constipation.

no side effects because they do not contain chemical composition

no addiction as they have no amount of drugs in them

treatment of problem from its root cause as they do permanent cure not temporary to stop problem for certain time

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