The answer is an average couple is fertile for only 6-7 days. If a couple cannot produce healthy sperm and egg there are the various treatment to help infertile couples to become pregnant and can have their own child. Infertility happens if there is the failure to conceive consecutive 12 months despite the attempts.
Answer:
the main body system is circulatory system?
Answer:
The correct answer is - option E.
Explanation:
African infants have had a higher chance of survival if they have a living grandmother who is with no young child of her own, this fact supports the evolution of menopause.
The 2 major hypothesis related to the evolution of menopause explains either to help the mother of the infant, protecting from the risk related to age-specific mortality or to provide maternal grandmothers who enhance their inclusive fitness.
Thus, the correct answer is - option E.
Answer:
The statement that best describes process of succession after a forest fire is A. Small plants grow but are eventually replaced by larger plants.
Explanation:
The example illustrated in this question is a kind of secondary succession.
Succession can be described as the variations in a particular community or ecosystem over a period of time. Succession has two types which are
- primary succession
- secondary succession
Secondary succession results due to natural disturbances like fire, storms, etc.
In this kind of succession, a natural disaster completely destroys a community leaving behind only barren soil. Over a period of time, Small plants start to grow on this land. Herbaceous plants are the first ones to evolve. Eventually, the larger plants start to grow later and the land becomes revived again.
Radiometic dating can be best described as <span>a technique to measure the relative age of rocks based on the radioactive decay of isotopes within the rocks</span>
