Answer:
Most cells within planarians tend to be very close to their gastrovascular cavity, in addition to their external environments. Also, planarians have the ability for oxygen and carbon dioxide to diffuse through the cells on their body walls: this makes it unnecessary for these varieties of flatworms to need a dedicated bodily system.
I think the deficiency of dedicated respiratory and circulatory systems in Planarians does not cause a problem because none of their cells are far removed from the gastrovascular cavity or from the external environment. Planarians are free-living flatworms and form the class Turbellarians in the Phylum Platyhelminthes. Flatworms have three tissue layers, that is the ectoderm, mesoderm, and endoderm.
hope this helps!!!!!....
Explanation:
Answer:
Energy can be changed from one form to another
Explanation:
Energy can't be destroyed or created
Answer:
The symptoms that a person with low testosterone would exhibit: fatigue, irritability, low sex drive, low strength, erectile dysfunction, hair loss, amongst others.
Explanation:
When the body is not producing enough testosterone, that is, low levels of testosterone -a very important sex hormone- it leads to a condition called male hypogonadism.
Depending on the age of the person, the male exhibits different symptoms. The most common ones are:
- Fatigue
- Irritability; mood changes; depressive symptoms
- Low sex drive
- Erectile dysfunction
- A reduction in the strength of the body
- Hair loss
This condition could be the result of different factors, such as <u>aging, chemotherapy, increased alcohol levels, radiation</u>, and diseases or syndromes such as <u>HIV, Kallman syndrome, hypothyroidism</u>.
