Which scientific design has limitations due to oversimplification? in a study of the interaction of air quality and crop yields, a computer compiles data that are collected by farmers from countries around the world. in a study of the effectiveness of a new drug on cholesterol, rhesus monkeys receive different strengths of the drug over a period of six weeks. in a study of the relationships between plants and their pollinators, researchers observe twenty plant plots in a meadow every day for three months. in a study of the effect of lawn fertilizer on the health of a backyard pond, biologists grow two colonies of duckweed in a large flask to represent pond ecosystems.

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

A50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. what is the new volume? 0.0100 ml 0.325 ml 25.0 ml 100. ml

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet