Aquatic: external fertilization
terrestrial: internal f.
The answer is I, II, III and IV. Scientific investigation is the way in which
scientists and researchers use a systematic approach to answer questions about
the world around us. They may want to explore new ideas, gather evidence or
prove or disprove previous results.
If you change two of the three variables than you don’t know if the change is caused by variable A or variable B. In this case if you keep light constant but change the amount of co2 and the color of the light, you can’t which of these two are affecting photosynthesis.
I think they are deciduous trees
