The correct order of the process that occurs when a sperm encounters an egg is the a. sperm reaches ovum, zona pellucida dissolves, zygote is formed, implantation occurs, and the embryo begins secreting hCG. b. zona pellucida dissolves, sperm reaches ovum, zygote is formed, implantation occurs, and the embryo begins secreting hCG. c. zona pellucida dissolves, sperm reaches ovum, zygote is formed, embryo begins secreting hCG, and implantation occurs. d. sperm reaches ovum, zygote is formed, implantation occurs, zona pellucida dissolves, and the embryo begins secreting hCG. e. sperm reaches ovum, zona pellucida dissolves, zygote is formed, embryo begins secreting hCG, and implantation occurs.

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

In 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? in 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. these bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.

What is the problem in this article? what solution does the article propose?