Acase-control study was conducted to determine if an association exists between workers in uranium mines and loss of fertility due to reduced sperm count. a group of 200 men with low sperm count were identified from clinics located in areas with uranium mines. each selected case was matched with a randomly selected male control on the following factors: race, age, area of residence, and smoking status. what is the purpose of matching?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Simulating adaptations in a species in this activity, you will discuss in detail the adaptations in a species of rain forest plants. you will build a simulation that explains the changes in the traits of the plant population over 10 years. you will also establish a scientific explanation to justify the changes in the traits of the population, * time to complete: 1-2 hours part a an organism's adaptations are specific to its native environment. an organism that lives in a coniferous forest will have different adaptations compared to an animal that lives in a tropical rain forest. the following graphs show the temperature and precipitation throughout the year for two different forests: a coniferous forest in canada, and a tropical rain forest in belize. evaluate the graphs, and then explain why plants from these two ecosystems will have different adaptations. in your answer, explain the survival challenges that plants face in these two environments.

What is the best-known carbohydrate?