The plague is always transmitted from animals to humans, never from humans to humans. a. true b. false

The given statement is false. Plague can be transmitted from animals to humans as well as humans to humans.

Plague is a type of infectious disease caused by bacteria Yersinia pestis and it affects rodents, some animals and human beings. Human beings are infected by plague on being bitten by flea which is infected with the bacteria causing plague.

On direct contact with the infectious tissues or fluids of animals infected or have died due to plague also increases the risk of being infected by plague. By inhaling respiratory droplets of the humans or animals in close contact infected by plague increases the chances of infection in humans.

littering streams           is the answer

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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