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Puzzle 3

Crossword Puzzle 2
Across
Plants are the prime example of it,organism that can produce its own food using light
poisonous substance
Unable to produce its own food,
source of food for fish and other aquatic organisms.
unclean or has a harmful effect to our environment
occurs when an aquatic system has an excess of nutrients
ingredient that help growth, provides energy,
First or importance
Mix with other liquid
the absence of oxygen
Down
Where plants, animals, and other organisms, work together to form a life
Symbole P, atomic number 15
Structure look like bacteria
The water fleas
an organism, which is part of the first level of a food chain
Third rank or order
science that studies how people or organisms relate to each other and their environment
the position that an organism occupies in a food chain - what it eats, and what eats it.
Can be found rliving in oceans, lakes, rivers, ponds and even in snow, anywhere on Earth.
Freshwater fish of othe salmon family,