What do you think is the primary reason why the Unionid mussel population declined whenever there is a dramatic increase in the Zebra mussel

When the Zebra arrived they ate all the food so the Unionid mussels declined as they died from the lack of food. Causing the Zebra Zebra numbers to increase and Unionid numbers to decline.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.

a) the particles of the chair are strongly held together.