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yKpoI14uk [10]
3 years ago
15

Which animal contains one body opening that serves as both mouth and anus?

Biology
1 answer:
liubo4ka [24]3 years ago
3 0
The answer is d a flatworm

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select one of the main body systems and explain why it is essential to keep the whole body functioning
tatiyna
Circulatory system: 

--The circulatory system is also known as the cardiovascular system. 
-- It is composed of the heart, blood, blood vessels and also includes the lungs. 

The primary function of the circulatory system to distribute oxygen, nutrients, hormones and other gases to cells of the other body systems. It delivers all the necessary components needed for all the cell activities. Without the circulatory system, we would not be alive. 

It is our blood that carries these necessary nutrients, hormones, and oxygen. All these components trigger certain processes that keep other organs functioning. It also plays a role in eliminating waste by carrying them to the necessary organs that will filter them out. Without a way to dispose of waste, the body will eventually die.
3 0
3 years ago
How would life on Earth be affected if water was less dense than ice?
Veseljchak [2.6K]

Answer:

freeze and sink over and over until the entire lake was frozen.

Explanation:

This would eliminate many aquatic organisms and produce a system with far fewer life forms in lakes which freeze periodically.

6 0
3 years ago
The lymphatic system is composed of all of the following except
zlopas [31]

OPTIONS:

A) lymphatic vessels.

B) the venae cavae.

C) the spleen.

D) lymph nodes.

E) lymph.

Answer:

B) the venae cavae.

Explanation:

The lymphatic system is an organ system that consists of a network of lymphoid tissues, lymphatic vessels and organs, which perform functions such as removal of toxins and unwanted materials, as well as production of immune cells that helps primarily in fighting against infection.

Lymphatic vessels, the spleen, lymph nodes, and lymph are all part of the lymphatic system.The venae cavae are two large vessels that empty deoxygenated blood received from all parts of the body into the right atrium. They are not part of the lymphatic system.

6 0
4 years ago
What organelle would you not find in a plant cell? Chloroplasts,centrioles,central vacuole,or cell wall?
Sedbober [7]

Answer:

Centrioles

Explanation:

If we look at ths other options Chloroplast and Cell Wall are both needed for a plant to survive and function. So we automatically know that it's going to be there so those aren't an option. We know that both animal and plant cells have a vacuole but plant cells have larger ones so we know that's not an answer. Leaving us with the only other possible answer left, Centrioles.

5 0
3 years ago
Read 2 more answers
3. Imagine that you are a drop of blood. What path would you follow through a
blondinia [14]

Answer:

a. Heart...

b. pulmonary artery

C. lungs

d. pulmonary vein

e. heart

f. aorta

g. arteries

h. big toe.

Explanation:

First I will go from the heart to the lungs through pulmonary artery in order to purification from carbondioxide and loaded oxygen. After that, I return to the heart through pulmonary vein and the heart pump this blood to the aorta which is a big blood vessel that branched into small arteries that reaches to every cell of the body and through these arteries I reach the big toe of the foot.

6 0
3 years ago
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