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mars1129 [50]
4 years ago
14

Why the circulatory system is considered to be a closed system?

Biology
1 answer:
Goshia [24]4 years ago
5 0

Explanation:

human have closed circulatory system. this means blood is always enclosed in the vessels  and the heart while circulating throughout the body IN this type of system blood is pumped by heart through arteries and veins and does not fill the body cavities thats why the circulatory system is considered to be a closed system

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Tentukan jumlah seluruh atom yg menyusun zat berikut<br> A.3NH4Cl<br> B.Pb(No3)2
Anna007 [38]
A.3NH4CI
Hope it's [email protected]!!!!!!!!!!!!!!!!........


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4 0
4 years ago
Community ecologists study the factors that determine the abundance of different species. The Abundance of three algae species (
Tema [17]

Answer:

Explanation:

Given that:

The abundance of three algal species in Lake A is now represented by the vectors:

[97, 84, 43] and [100, 80, 50]

Now if we look at Lake A, the change occurring in the vector of algae species can be determined as:

a = [100 -97, 80 - 84. 50 - 43]

a = [3, -4, 7]

Thus, the magnitude of that change is:

|a| = \sqrt{(3)^2 +(-4)^2+(7)^2}

|a| = \sqrt{9+16+49}

|a| = \sqrt{74}

|a| =8.6 \ mg/mL

The abundance of three algal species in Lake B is now represented by the vectors:

[25, 59, 22] and [20, 63, 15]

At Lake B, the change occurring in the vector of algae species can be determined as:

b = [20 -23, 63 - 59. 15 - 22]

b = [-3, -4, -7]

Thus, the magnitude of that change is:

|b| = \sqrt{(-3)^2 +(4)^2+(-7)^2}

|b| = \sqrt{9+16+49}

|b| = \sqrt{74}

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Hence, for both Lake A and B, the magnitude of change is the same.

7 0
3 years ago
Differences in traits are called
Tcecarenko [31]

Answer:

The observable traits expressed by an organism are referred to

EXPLANATION:

An organism's underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype. Mendel's hybridization experiments demonstrate the difference between phenotype and genotype.

3 0
3 years ago
Explain how it is possible to have thousands of different protiens when there are only 20
solmaris [256]
This is possible because proteins are created from different combinations of amino-acids. While we only have 20 different kinds of aminoacids, these 20 kinds can create thousands of combinations that we can observe in our bodies and bodies of other mammals as well as other organisms. 
5 0
3 years ago
How have phosphate minerals most affected human activity
sasho [114]

Answer:

How have phosphate minerals most affected human activity? Using phosphate minerals in fertilizer allowed humans to grow more crops. The availability of rock and mineral resources has major effects on human activity.

Explanation:

hope this helps

6 0
2 years ago
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