Gradual changes in the frequency of diseases over long periods are known as SECULAR TIME TRENDS. For example, the rate of mortality in USA due to coronary heart diseases over a period of time. Onset of puberty in girls is also a secular time trend.
Secular time trend is also referred as Secular Variation and Secular Drift.
The form of choose is sllt
<span>Well this isn't actually a question but to market to a company like this you first have to impress a small number of people in a single chain of command. Your products don't have to be marketed to a company as a whole or to a single rung of the food chain but to each successive member in a hierarchy in the company. Firstly to the employee, then to their management then to the ones who actually making the decision to buy.</span>
1.
Paramecium
2.
Amoeba
3.
Paramecium
4.
Euglena
5.
Volvox
6.
Amoeba?
7.
Amoeba
8.
Cilia
9.
Flagellum
10. Psuedopods
11. Flagella
12. Euglena
(Chloroplast)
13. Amoeba
14. Euglena
15. Paramecium
16. Paramecium
17. Amoeba
18. Volvox
I hope this is all correct!