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cestrela7 [59]
3 years ago
14

How do you scientist know that the universe is expanding

Biology
2 answers:
Vlad [161]3 years ago
6 0
It will be B hope that helped
sveticcg [70]3 years ago
3 0

Answer:

B) The Doppler Effect shows stars with blue shifted light

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Como crees que es la relación y producción de Oxigeno y Dióxido de carbono en los seres vivos?
Oduvanchick [21]

Answer:

Oxygen is inhaled so that Dioxide can be exhaled, that is just how breathing functions.

Explanation:

We require this system for our survival.

4 0
3 years ago
Agents of erosion can be all of the following except
BARSIC [14]
The answer is D. Gravity
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3 years ago
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Knowing the epidemiology and causative agent of Legionaries disease what questions would you ask of the victims or of their surv
ioda

Answer:

Answered below

Explanation:

Legionnaires disease is a type of lung inflammatory disease or pneumonia, which is caused by infection from the bacteria Legionella bacterium.

Legionella bacterium can be spread by inhalation from water or soil. People with weakened immune systems are most susceptible as are smokers. Untreated legionnaires disease can progress to a fatality.

Some of the questions to ask of a victim or of surviving relatives include;

1) Any visits to swimming pools?

2) Source of drinking water?

3)Any visits to fountains?

4) Contacts with victims and their personal belongings?

5)Is any relative or victim immunocompromised? Do they have diseases that might lower their immune response?

6) Are they smokers?

8 0
2 years ago
Which of these is part of a feedback loop that results in a cooling effect on Earth?
irga5000 [103]

Answer:

B. As snow and ice melt, the underlying surfaces absorb heat from solar radiation

Explanation:

Which of these is part of a feedback loop that results in a cooling effect on Earth as snow and ice melt, the underlying surfaces absorb heat from solar

8 0
3 years ago
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Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.
yaroslaw [1]

Answer: The calcium ion binds to troponin, and this slides the tropomyosin rods away from the binding sites.

Explanation:

Contraction and relaxation of muscle cells brings about movements of the body. The contractile myofilament called sarcomeres are bounded at each end by a dense stripe called the Z - line, to which the myosin fibres are attached, and lying in the middle of the sarcomere are the actin filaments, overlapping with the myosin.

When action potential spreads from the nerve along the sarcolemma (muscle cell membrane), it penetrates deep into the muscle cell through the sarcoplasm (cytoplasm of muscle cell), and releases CALCIUM from the intracellular stores.CALCIUM triggers the binding of myosin to the actin filament next to it forming CROSS BRIDGES.

For this to occur, ACTIN BINDING SITE has to be made available. TROPOMYOSIN is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin. The first step in the process of contraction is for calcium ions to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands.

3 0
2 years ago
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