When a membrane allows certain materials to move in and out, it is called:

Why does bubbling occur when vinegar mixed with baking soda

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid

Achemical that is released by an animal as a signal to other members of the same species is called a pheromone. t or f