I need help please Several hundrer years ago, in a dusty alley in a small North African seaport, a flea jumped onto the back of a dying rat, and bit it. On another continent, millions of people would die because of that flea bite

Disease bacteria from the rat grew inside the flea. The flea hopped onto a passing sailor and bit him, injecting the man with deadly germs.

If the sailor noticed the flea bite, he thought little of it. Vermin were part of his life. Yet only five days out to sea, after a bout of fever, chills, and with ugly discolored lumps under both arms, the sailor's dead body was thrown into the sea. Sickness spread to the crew - and to the ship's rats. The rats passed the disease to more fleas. On arrival in Italy, the ship delivered a carfo of death.

The ship delivered bubonic plague to Europe. The plague spread quickly and killed many. Medieval workers walked the streets chanting, "Bring out your dead!" In an attempt to keep up with all the burials.

If you were a public health worker, what steps would you take to protect people from an epidemic? Be specific.

structure is maintained and sustained by:

-cytoskeleton: gives cells coherence

-cell wall: support

-cytoplasm: shape

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fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

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