Answer:
papillary muscles
They are muscles located in the ventricles of the heart and particularly associated with anchoring the right and left atrioventricular valves.
Began in the water
first evolved around 3500 million years ago
began as single celled organisms
The second line of defense is nonspecific resistance that destroys invaders in a generalized way without targeting specific individuals: Phagocytic cells ingest and destroy all microbes that pass into body tissues. For example macrophages are cells derived from monocytes.
Answer:
The frog is a secondary consumer
Explanation:
its not a primary producer because it doesnt start the chain
its not a primary consumer because the frog can still be eaten
and it cannot be a decomposer because it is not a fungi or other kind of carcass eating creature
