С4 переделать в косвенную речь

The Photosynthesis (Фотосинтез это определенное действие)
involves the uptake of carbon dioxide, water
and other nutrients by plants to form organic matter and oxygen . (Все без артиклей, так как предметы во множественном числе появились в тексте первый раз) 
Я не могу обїяснить почему так 
There is a (употреблено в первый раз)
wide variety of plant life in the rainforest 
There have been
thousands of (первый раз, мн.ч) studies on the
effects of herbs (эффект трав определен)
For centuries,(1 раз, мн.ч) drugs
have been made from an (первый раз, любое животное)animal and (п.раз, мн.ч) plant extracts 

In today's world , each of us has the opportunity to not only meet with scalps against him man but himself to play the role of the aggressor. For some, the reason for this conflict to work for someone - the behavior of drivers on the road , for someone - hazing in the army. Of course , it is impossible to assess the level of aggression only on the recorded data , which is what , for example, allegations of violations, criminal statistics or statistics of suicides.Aggression can be directed to the person who hinders the achievement of objectives of the surrounding objects to those who are not to blame, but simply " to hand " or by itself , the so-called autoaggression . You can talk about the intentional or accidental aggression , instrumental (to reach a certain goal ) or hostile ( to hurt someone .)To avoid becoming a victim of aggression , you must adhere to the following printsipov.1.Ne afraid aggressor , stay confident.2.Postaraysya remain calm , speak slowly , clearly and firmly .3.Do not be rude in return and do not fight me .4.Use (choose ) the following strategies of behavior:- firmly and confidently say that you do not like such treatment ;, joked in response ;- quietly go away ( do not run away !)- Ask for help from friends or older , if you can not handle himself .