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Andre45 [30]
4 years ago
7

Describe a chemical and physical change with an example for each

Biology
2 answers:
ArbitrLikvidat [17]4 years ago
8 0
<h2>ANSWER:</h2>

physical changes are reversible while chemical changes are irreversible

<h2>EXPLANATION:</h2>

physical changes are reversible,  they can come back to their shape while chemical changes are irreversible in which chemical properties of a substance also change and cannot attain its original shape.

example:

physical change: ice convert into the water and vice versa.

chemical change: wood burned to form ash

Bad White [126]4 years ago
6 0
A chemical change is a change in which the composition of the matter is changed at the molecular level, most chemical changes are not easily irreversible, for example, an egg being cooked, the egg changes from its liquid like state to a solid, and it is not possible to revert it back to its original change. The egg itself is changed in this case.
A physical change on the other hand however, is only changing the substance of a matter, not its composition, this is usually easily reversible. For example, water turning into ice, the water's substance changed from its liquid state to its solid state, it is still water, and it can easily be turned back into water by heating it.

Sorry for the long explanation,
Hope this helps!
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What did charles darwin hypothesize about the origin of bipedalism?
Firdavs [7]

Charles Darwin has the first or the origin of the bipedalism hypothesis.  Human beings are compared to apes and he also suggested enormous brain and upright locomotion were link. He also suggested human evolved into larger brains when still ape-like-tree-dwellers. Humans are bipedal because they have free hands to carry and manipulate tools and having tool-use, lost their project canning.

6 0
3 years ago
Describe the general flow of energy through an ecosystem beginning with the Sun and going through a third order consumer.
Illusion [34]

Answer:

1) Autotrophs transform solar energy into chemical energy.

2) Herbivores and omnivores (primary consumers) eat producers, make use of some of the energy, making from it their biomass.

3) Following, carnivores or predators (secondary, tertiary, and other consumers) eat herbivores, using only 10% of the flowing energy.

4) Decomposers (last order in the chain) recycle all the dead organic material and make use of some of the stored energy.  

Explanation:

<u>Energy flow: </u>From the whole quantity of energy that reaches the earth's surface, only 0.1 or 1% is absorbed by autotroph organisms or producers.  

From this input of solar energy, it begins a unidirectional energy flow through all the organisms in the ecosystem, from autotrophs to heterotrophs, until it is finally dissipated in the environment.  

Organisms that can use light, and turn it into organic matter according to their own needs are producers, and they are called autotrophic organisms. These organisms are by excellence all plants, algae, and bacteria that photosynthesize. Organisms that are incapable of producing their food are called heterotrophic. They depend on other organisms from the trophic chain such as plants or other animals to feed on, so they can get proteins and energy.  In the trophic web, heterotrophic organisms occupy the first, second, or third consumer level, after producers.  There are different types of heterotrophic animals: carnivorous, herbivorous, omnivorous, hematophagous, ichthyophagous, and etcetera. All of them depend on autotrophic organisms.

At each trophic level, it occurs an energy transfer from one level to the next, with only 10% being usable in each of them. This assessment is called <u>"The 10% rule".</u> This is, as a general rule, only about 10% of the energy stored as biomass at one trophic level, per unit time, ends up as biomass at the next trophic level, in the same unit of time.

The progressive reduction of energy determines the number of trophic levels in the chain (4 or 5).  

1) Autotrophs use water, CO2, and solar energy to produce O2 and glucose, by the process of photosynthesis and convert it into biomass. Producers transform solar energy into chemical energy.

2) Herbivores and omnivores (primary consumers) make use of some of this energy to survive, making from it their biomass. The rest of the energy is lost.

3) Following, carnivores or predators (secondary, tertiary, and other consumers) eat herbivores, using only 10% of the flowing energy. The rest of the energy is lost.

4) When different organisms die, decomposers (last order in the chain) recycle all the organic material and make use of some of the energy stored in their tissues. The rest is lost.

4 0
3 years ago
Describe how the genotypes RR and Rr result in the same phenotype.
Pachacha [2.7K]

Answer:

The parents. Describe how the genotypes RR and Rr result in the same phenotype. Because if there is one dominant then it shows the dominant trait not the recessive trait. Summarize how polygenic inheritance differs from Mendelian inheritance.

Explanation:

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3 years ago
What was Simards first aha moment that there might be more to how trees coexist than we know
ArbitrLikvidat [17]

Answer:

Her “aha” moment was when her dog Jigs fell into the outhouse by the lake.

Explanation:

Hope this helped.

4 0
3 years ago
How does the correct amino acid sequence compare to the mutated sequence?
katrin2010 [14]
One amino acid in the sequence would be changed
4 0
3 years ago
Read 2 more answers
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