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Juli2301 [7.4K]
3 years ago
11

The delivery of oxygenated blood to all tissues around the body involves what two life functions? A) Digestive and circulatory B

) Excretory and circulatory C) Respiratory and circulatory D) Digestive and respiratory
Biology
1 answer:
pickupchik [31]3 years ago
7 0

Answer:

Respiratory and circulatory

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I'm sorry, but I would need to see the options.

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Why does the concentration of CO2 go up and down throughout the year?
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the role of plants in carbon cycle

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the amount of CO2 found in the atmosphere varies over the course of a year. much of this variation happens because of the role of plants in carbon cycle...respiration occurs all the time, but domains during the colder months of the year, resulting in higher CO2 levels in the atmosphere during those months.

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What are the factors that determine the level of harm an introduced chemical has on the environment? (Site 1)
astra-53 [7]

Answer:

Following are the factors are given below:-

Explanation:

In general, the toxicity of a substance depends on the following factors.

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4 0
3 years ago
In humans there is approximately 30% adenine (A). What is the percentage of each of the other 3 DNA bases?
kvv77 [185]

In Double Stranded DNA , Adenine pairs with Thymine as we know, it means amount of A = Amount of T. Here A=30% so T=30%

Total will be 100% (for all 4 bases) , left out is 30 % which will be equally divided by Guanine and Cytocine , hence G=20% and C=20%.

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7 0
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The germinal stage of prenatal development:________.a. development proceeds very slowly at this stage.b. cells are already highl
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Answer:

the correct answer is D

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6 0
3 years ago
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