What is true of intercellular signals that do not go through direct connections between cells, such as plasmodesmata?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm

Which of the following human activities resulted in the growth of the north american deer population?