Which group of components is common to the circulatory systems of most living animals?

Which of these terms are associated with communication between neurons? chemical signals, electrical signals, synapse chemical signals, synapse, neurotransmitters synapse, electrical signals, chemical signals synapse, electrical signals, neurotransmitters

These two squirrels live in the same ecosystem. what type of interaction do the images represent? a. direct competition b. mutualism c. interference competition d. symbiotic e. indirect competition

The graph shows a trend in an ecosystem over time caused by increased pollution in the region. what can you conclude from the graph? a. there’s lower biodiversity among birds. b. there’s a higher reproductive rate among birds. c. there’s a significant decline in the number of producers. d. other types of animals were unaffected by pollution.