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2 years ago

Is it B or D , Help !!!

Biology

2 answers:

faltersainse [42]2 years ago

8 0

Answer:

Explanation:

electrons is a thing itself with magnetic energy

avanturin [10]2 years ago

4 0

Answer:

Explanation:

my sis took the test

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6) What term describes an educated guess that needs to be tested by

faltersainse [42]

Theories are educated guests that are tested by experiments

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1 year ago

The principle hormones produced by the thyroid gland are.

Alex73 [517]

Answer:

T3 (tri-iodothyronine) and T4 (thyroxine).

Explanation:

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2 years ago

Name two types of evidence scientists use to support the theory of evolution. Give an example of one and describe how it shows t

dangina [55]

Darwins's theory of natural selection is an evidence of evolution by acquiring characters that make survival of an organism feasible in a typical environment.
Fossils records are used to support this theory, by figuring out the common ancestry of different species and different traits that have evolved in them with time.
Embryology is also used as an evidence which shows common origin of the organisms. Other evidences are geographic distributions and homologous structures of the living organisms.

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2 years ago

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While on safari in Serengeti National Park, Tanzania, your friend ventures away from camp and is bitten by a black widow spider.

Kobotan [32]

Answer:B antvenin as is always specific

Explanation:othe like antigen are for antibodies snake venom is just venom while penicillin is from fung

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2 years ago

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2. Beginning with the superior vena cava, trace the path followed by a red blood cell as it passes into and through the heart, t

Katen [24]

Answer:

BLOOD PATHWAY:

Body > superior and inferior vena cava > right atrium > tricuspid valve > right ventricle > pulmonary semilunar valve > pulmonary artery > lungs > pulmonary vien > left ventricle > bicuspid/mitral valve> left ventricle > Aortic semilunar valve > Aorta > Body

The pathway goes like this:

From the body (we don't say first because this is a cycle), unoxygenated blood collected goes to the heart via the INFERIOR and SUPERIOR VENA CAVA then it empties into the RIGHT ATRIUM from there it passess through a valve called TRICUSPID valve, which prevents backflow of blood to the right atrium. The blood goes to our first pumping chamber, RIGHT VENTRICLE. The right ventricle pumps the blood through the PULMONARY SEMILUNAR VALVE which leads to the PULMONARY ARTERIES, which happens to be the only arteries that carry unoxygenated blood. From there it goes to the lungs to pick up oxygen and rid itself of carbon dioxide. The blood then goes back into the heart via the PULMONARY VEINS and like the latter, they are the only veins that carry oxygenated blood.

The blood then goes back into the heart, emptying into the LEFT ATRIUM. From there it goes through the BICUSPID VALVE or MITRAL VALVE and to the last and thickest pumping chamber, the LEFT VENTRICLE. The left ventricle pumps the blood through the AORTIC SEMILUNAR VALVE which opens out to the AORTA.

And at last, it goes back to your body.

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2 years ago