Oxygen is a substance that dissolves in water. Fish absorb oxygen from the water. When dissolved oxygen levels are low, it can be hard for organisms to survive. Is this the chemical property or physical property and why

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20

Which element forms the basis of all organic organisms a carbon b oxygen c hydrogen d nitrogen