In the late 1600s, English astronomer Edmond Halley presented a model of Earth’s structure. Halley originally claimed that Earth was composed of an outer rocky shell and an inner rocky sphere, separated by a wide gap filled with glowing air. He thought that Earth had two sets of magnetic poles: one permanent set that originated on the surface, and another set that originated in the inner sphere. Halley believed that the inner set of magnetic poles moved over time, because the inner sphere rotated slightly slower than the outer shell. He also thought that the inner sphere was just as habitable as the surface. Halley knew that his model was hypothetical and might not be completely correct, but he thought that it could explain some important observations, calculations, and inferences about Earth’s properties. His model was based on information and evidence available at the time, but it was also based on some nonscientific beliefs that many people at the time accepted. The idea that Earth is hollow was not new—many people thought that there were vast caverns that extended deep into Earth’s interior.

Suppose that you know very little about Earth’s interior and want to find out how accurate Halley’s model is. How would you go about evaluating the validity of the model? What sort of evidence would you need to collect and how could you collect it?

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.

explanation:

i know can you plzz me with this question im sorry i didt answer your question i just need hel.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.