Answer:
More carbon dioxide (CO2) would be in our atmosphere.
Explanation:
Plants undergoing photosynthesis take in carbon dioxide (CO2) and give out oxygen (O2). They essentially use the CO2 to make sugars that keep them alive. Excess plant CO2 is then given off back into the environment, just like how we exhale CO2 after taking a breath.
So, no plants to take in the CO2 equals more CO2 in the environment.
Think of it kinda like this: I like Pop Tarts. If there is less or none of me in the world, there are more Pop Tarts just... out there... waiting to be eaten.
Answer:
The answer is: It means it is a membrane that will allow certain molecules or ions to pass through it by means of active or passive transport.
Explanation:
All cells are enclosed with a cell membrane. The term, selectively permeable, refers to :
the membrane allows some substances or molecules to enter the cells, and others to be prevented from entering. It also allows substances to leave the cell.
This process can be done by :
Active transport -requires the cell to expend energy to move the materials.
Passive transport- it can be done without using cellular energy.
B a star
C a nebula
D the sun
E the force of gravity
Answer: Option 'B' is correct.
Explanation:
All the iron molecules that are in your body were originally created by a star.
During a star supernova, a very large amount of energy and neutrons are released by stars which allows heavier elements to be produced.
And when there is explosion of star occurs, those elements are found which is used to make DNA and DNA contains large amount of iron molecules.
Hence, Option 'B' is correct.
I think the answer is B - a star! Hope this helps!
a. 0%
b. 25%
c. 50%
d. 75%
(PLEASE HELP AND EXPLAIN)!!!
water
oxygen
sodium chloride
in most metals
in organic compounds
in inorganic compounds
We can expect to find carbon in all living organisms and in all organiccompounds. So the correct options are A and C.
Carbon is an element found on the earth. It is an extremely abundant element with unique properties. Carbon is present in the environment in pure or almost pure forms.
Diamonds and graphite are some of the pure forms of carbon. Carbon also forms compounds with other elements for the formation of molecules.
These carbon-based molecules are the basic building blocks of all living organisms including humans, animals, plants microorganisms etc.
These also present many components of the environment. They are called organic molecules. Greenhousegases like carbon dioxide and methane are examples of carbon-based molecules.
They are also present in high percentages of fossilfuels. They are mainly made up of hydrocarbons which are molecules composed of hydrogen and carbon.
Therefore the correct options are A and C.
Read more about carbon, here
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Answer: A and C
in all living organisms
in organic compounds
Explanation:
Answer:
Oxygen is essential for respiration because the body uses it to 'burn' food molecules. Animals take in oxygen when inhaling and give off carbon dioxide when exhaling. ... This is why rescue breathing works - it can supply a non breathing patient with enough oxygen to support life.Nitrogen is essential for all living things because it is a major part of amino acids, which are the building blocks of proteins and of nucleic acids such as DNA, which transfers genetic information to subsequent generations of organisms.
Explanation:
Free oxygen can be problematic for organisms due to its high reactivity and the production of reactive oxygen species (ROS), causing oxidative stress and various health problems. Excess free oxygen can lead to diseases in humans, while some organisms cannot tolerate free oxygen at all and will die if exposed to it.
Free oxygen can be a problem for many organisms due to its high reactivity. In aerobic organisms, free oxygen can lead to the production of reactive oxygen species (ROS) such as superoxide radicals, hydrogen peroxide, and hydroxyl radicals, which can damage cellular structures and molecules, including proteins, lipids, and DNA. This can result in oxidative stress and lead to various health problems.
For example, in humans, excess free oxygen can cause damage to cells and tissues, leading to diseases such as cancer, cardiovascular disease, and neurodegenerative diseases. Organisms that have evolved to survive in low-oxygen environments, such as certain bacteria and parasites, may be particularly sensitive to the presence of free oxygen and can even be killed by exposure to high levels of it.
In contrast, other organisms, such as obligate anaerobes, cannot tolerate the presence of free oxygen at all and will die if exposed to it. These organisms lack the enzymes and metabolic pathways required to deal with the toxic effects of oxygen. Examples of obligate anaerobes include some types of bacteria that live in environments without oxygen, such as deep-sea hydrothermal vents or the intestines of animals.
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