Answer:
where is the question i cant see some thing
Answer:
Double Helix
The structure of DNA is called a double helix.
The risk factors of testicular cancer are;
1. Hiv infections
2. Family history of testicular cancer.
3. Males who are known to have an undescended testis.
The subjective of testicular cancer include;
1. Evidence of metastasis which include gyro, back pain.
2. Feeling of heaviness in the testicles.
3. Swelling and lumps of testes
Objective of testicular cancer include;
1. Swelling of lymph nodes in groin
2. Lump which is palpable.
3.Enlarged testes which will have no pain.
This is because human have a much larger surface area.
Small organisms have a small surface area and thus simple diffusion meets their transport requirements.
As the size of the organisms increases, its surface area to volume ratio decreases. This means it would take days for molecules to diffuse through a large animal, so humans have a circulatory system with a pump to transport materials quickly around their bodies.
Therefore due to their large size, humans require a specialized transport system.
