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1. Irritability
2. tissue
3. herbivore
4. mitosis
5. ecological niche
6. producer
7. mutation
8. growth
8. carnivore
9. occus
Question to match with answer<
A. increase in cell size or number.
b. reproduction of the cell that produces two exact copies of the parent.
c. development stage in insects.
d. a group of cells that have the same structure and function.
e. green plant that traps the sin's rays and converts them to chemical energy.
f plant-eating organism .
g. a change in the hereditary information of chromosomes.
h. were an organism is and what does.
I. the ability to respond to an enviromental stimulus.
j. round bacterial shape .
k. flash-eating organism.

I have Rosetta Stone, but I’m a bit irritated with it because it offers NO grammar explanations or reasoning for sentence constructions. It’s also extremely dull and easy to choose the correct answer even if you don’t quite understand what it is you’re choosing.
What are some good (preferably FREE) alternatives?
I already learned one language through textbooks and SRS (Anki), so I would like to go about Spanish a bit differently. I want it to be a little more fun. For example, it would be great if there were a variety of activities/drills/worksheets/games/etc.
Please don’t respond with affiliate links to poor programs. Remember, I am looking for something free if possible.
Thanks.