Answer:Stress that all living beings are systems. This is the main principle of the unity of life. A system has a unity that is not equal to the sum of its parts. ... Emphasize that the diversity of life has its roots in different conditions under which different biological organisms evolve and exist.
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Answer: b. They can live away from water
Explanation:
The frogs are the amphibian organisms, which are capable of survival both in water as well as land. In frogs external fertilization is used as a mode of sexual reproduction. The females lay their eggs in water in the same time the males also secrete their sperms in the water. The eggs are fertilized by the sperms in water. For reproduction the frogs are dependent on water. But with the evolution of frogs, which allows them to fertilize the eggs on the land. The frogs can live away from water.
Answer:
fleas carried the disease and there were fleas on rats and the rats hid in ships going across the oceans and then ran out when the ships arrived to their destined place. the fleas then traveled to household pets such as cats and dogs and because those pets came in contact with humans thats how humans caught it.
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