1. Through blood transfusion
2. Unprotected sex
3. In contact of body fluids
4. Mother to baby during birth or through breast feeding.
The wide range of eye color indicates that eye color is...polygenic
Vascular tissue
Of course plants don't have hearts, but they do have vessels which transport water, minerals, and nutrients through the plant. These vessels are the vascular tissue.
Answer:
It allows flexibility (adjustment) and survival of a population in the face of changing environmental circumstances.
Explanation:
