Ineed with questions 40 and 41 and #40 is what is a common feature of both the walnut and the oak? #41 is which tree is not shown in the diagrams? and it’s very hard and i’m struggling with it and if you need to see the picture big then click on it and it will be big

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.