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3 years ago

12

The plasma membrane is considered a barrier to the environment because __________. no molecules may pass through it it controls

the passage of molecules into the cell it is located outside of the cell wall only water and small molecules may penetrate the membrane

1 answer:

NARA [144]3 years ago

6 0

Because of active transport

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What's is in the earth planet

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Three of the most prominent definitions of species are the biological species concept, the phylogenetic species concept, and the

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An individual can be placed or classified into a particular species depending on the concept a scientist has considered,

The three most prominent are Biological, morphological and phylogenetic species concept.

1. Biological species concept- Individuals that can interbreed naturally are placed into the same species. Therefore, Biological species concept, not applicable for extinct species

2. Morphological - Relies on similarities in structure

This species concept places individuals having similar body structures into the same species. It can be easily applied to asexual and extinct species.

3. Phylogenetic - Based on evolutionary history

Species are classified according to a common ancestor.

4. Morphological and Phylogenetic

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5. Morphological, Phylogenetic, and Biological

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2 years ago

Point source pollution comes from sources that are___?

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C. Basically unknown

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PLEASE HELP EMERGENCY!! IF YOU ARE NOT 100% SURE ABOUT YOUR ANSWER DO NOT ANSWER THEN!! PLEASE!!

marysya [2.9K]

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Lung disease is any problem in the lungs that prevents the lungs from working properly. There are three main types of lung disease:

Airway diseases -- These diseases affect the tubes (airways) that carry oxygen and other gases into and out of the lungs. They usually cause a narrowing or blockage of the airways. Airway diseases include asthma, COPD and bronchiectasis. People with airway diseases often say they feel as if they're "trying to breathe out through a straw."

Lung tissue diseases -- These diseases affect the structure of the lung tissue. Scarring or inflammation of the tissue makes the lungs unable to expand fully (restrictive lung disease). This makes it hard for the lungs to take in oxygen and release carbon dioxide. People with this type of lung disorder often say they feel as if they are "wearing a too-tight sweater or vest." As a result, they can't breathe deeply. Pulmonary fibrosis and sarcoidosis are examples of lung tissue disease.

Lung circulation diseases -- These diseases affect the blood vessels in the lungs. They are caused by clotting, scarring, or inflammation of the blood vessels. They affect the ability of the lungs to take up oxygen and release carbon dioxide. These diseases may also affect heart function. An example of a lung circulation disease is pulmonary hypertension. People with these conditions often feel very short of breath when they exert themselves.

Explanation:

Put it your own words cause this is kinda advance for 7th

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2 years ago

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