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ehidna [41]
3 years ago
8

Explain why humans need a circulatory system to transport oxygen, while single-celled organisms like the amoeba do not.​

Biology
1 answer:
IrinaVladis [17]3 years ago
7 0

Answer: Single cell organisms dont need a respiratory system because oxygen and carbon-dioxe diffuses between their body tissues and the enviorment.

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Humans only have a few eye colors and only four ABO-based blood types. How can DNA tests definitively identify individuals when
ehidna [41]
The correct answer is that variable number repeats are used in DNA tests; they have hundreds of possible lengths. Eye color is determined by variations in a person's genes. Most of the genes associated with eye color are involved in the production, transport, or storage of a pigment called, melanin. Eye color is directly related to the amount and quality of melanin in the front layers of the iris. 
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A relationship in which one organism is helped and another organism is neither helped nor hurt is called
algol13

Answer:

Commensalism

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Commensalism is when one organism is helped while the other is neutral (neither hurt nor helped).  Example: clownfish and anemone.

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Scientists tested the effect of a fertilizer on the growth of plants. They had 2 sets of plants, Group A which gets fertilizer,
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3 years ago
Individuals belonging to the subculture known for love of motorbikes and leather. Rival of the group known as mod
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The subculture with an affinity for motorbikes and leather is known as Rockers. The rival group, those that prefer fashion and music, is known as Mod. These subcultures are of British origin and are divided on the basis of their tastes.

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The first element of the periodic table is:
vitfil [10]

Answer:

The anwser Is B:Hydrogen

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2 years ago
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