The data here indicates the number of species of amphibians that are affected by several factors in their environments. Which human action would most greatly reduce the number of amphibian species threatened for extinction?

A) reducing the use of chemical pesticides
B) preserving habitats and preventing further habitat loss
C) preventing the movement of invasive and nonnative species across the globe
D) investing in research to identify infectious disease sources and prevention

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20

Kelly ran electricity though a sample of water using electrolysis. the water changed into two gases, x and y. it was not possible to break down the gases x and y into simpler particles.

Classify the structures as homologous or analogous, depending on their structure and function.