In humans sperms can survive 3 -5 days within the female reproductive tract.
The ideal time of fertilization is around ovulation when the egg is in the fallopian tube. After travelling through the vaginal canal, the strongest sperm make it to the cervix. From here, the sperm must travel through the uterus and into one of the fallopian tubes.
The head should be positioned in the upper of the body.
The weight of the center body should be over the pelvis.
The legs and knees should be stable enough to support that body's weight
Explanation:
For humans to keep a balance while walking, their body must be properly positioned in the right manner.
- The head must be fixed and positioned straight on the upper body. It should not at any point be unbalanced by being projected too forward or backward or to the side.
- The weight of the center body should be over the pelvis. The alignment gives the proper positioning of the center of gravity of the human body.
- The pelvis should carry and spread the weight of the body to the body parts that attaches to it.
- The legs and knees should be straight and stable to support the weight of the body.
- If they are not strong enough the body will wobble and not be balanced.
learn more:
Body weight in individuals brainly.com/question/6957100
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