Answers:
Menorrhagia
Explanation:
Menorrhagia is a heavy or prolonged vaginal bleeding that happens in conjunction with menstrual cycle. It is the medical keyword for menstrual bleeding that takes a longer period of more than 7 days. This heavy bleeding causes frequent change of tampon or pad and pass larger clots.
It is mostly seen in women and its due to hormone malfunction, problems with the uterus, or other health situations. it is more often diagnosed with a pelvic exam, ultrasound, pap test, and sometimes a biopsy.
 
        
             
        
        
        
Answer:

Explanation:
We recognize that total occurrence equals new cases of disease over time divided by the number of people at risk at the onset.
Mathematically:

Given that:
Number of the population at risk = 1000 individuals
New cases during Jan 1 - Dec 31 = 60 because;
At 20 occurred on June 30 & 40 on Sept. 30) & no new cases were identified after that:
∴

 
        
             
        
        
        
One of the reasons why the fish population remains approximately the same from one generation to the next is because not all the eggs laid will survive to adulthood. There are several factors which bring about elimination of the the newly hatched eggs. Examples of these are predators and diseases which eliminate the young offsprings at different stages before they develop into adulthood. 
Secondly, production of many eggs by the different fish species leads to competition for survival. Resources such as water, food, oxygen and shelter have to be fought for and its only the fittests that will be able to survive till the reproduction stage.