The correct answer is A. Amoeba.
Amoeba is a single-celled organism that reproduces by binary fission. Binary fission is a type of asexual reproduction in which a single cell divides into two identical daughter cells. The process of binary fission begins with the replication of the cell’s DNA. The replicated DNA is then distributed to each daughter cell. The daughter cells then divide into two new cells, each with its own nucleus and cytoplasm.
B. Liver fluke is a parasitic flatworm that reproduces by sexual reproduction. Sexual reproduction involves the fusion of gametes from two individuals to produce a new individual. The liver fluke’s life cycle includes two hosts: a snail and a mammal. The liver fluke reproduces sexually in the snail host and then produces eggs that are released into the environment. The eggs are ingested by a mammal, where they hatch and develop into larvae. The larvae migrate to the liver, where they mature into adults. The adult liver flukes reproduce sexually and produce eggs that are released into the environment.
C. Plasmodium is a parasitic protozoan that causes malaria. Plasmodium reproduces sexually in the mosquito host and then produces sporozoites that are injected into a human host. The sporozoites travel to the liver, where they mature into merozoites. The merozoites then invade red blood cells, where they multiply and cause the symptoms of malaria. The merozoites eventually rupture the red
blood cells, releasing new merozoites that can infect other red blood cells. The cycle of infection continues until the person is treated with antimalarial drugs.D. Planaria is a flatworm that reproduces both sexually and asexually. Sexual reproduction involves the fusion of gametes from two individuals to produce a new individual. Asexual reproduction can occur by fragmentation, in which the planarian breaks into two or more pieces, each of which can regenerate into a new individual.