Select each correct answer. More than one answer may be correct.
Which of the following relationships is symbiotic?

A. A group of ants work together to build an underground nest.
B. A tick latches on to the body of a dog and feeds on the dog’s blood.
C. A remora attaches to the body of a shark and feeds on scraps when the shark eats.
D. A male bluebird and a female bluebird provide care for their offspring.
E. Two male red-winged blackbirds fight over territory.
F. A bee pollinates a flower while feeding on the flower’s nectar

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?