A simlple machine of velocity ratio 20 is used to lift a load of 600N by applying effort of 40N. Calculate the mechanical advantage and efficiency Of the machine.​

Sampling lake water for microscopic organisms is not as easy as it sounds when you want to both count and identify species. in a given water sample, your bacteria of choice can be rare or difficult to culture, particularly given the mixture of bacteria in a biofilm. which of the following culture media would be best for growing fecal coliforms when they are relatively less abundant than other bacteria in the lake? anaerobic culture medium enrichment culture medium complex culture medium basic culture medium

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring

How can active reading strategies you? o a. they can you get into better physical shape. o b. they can you read fewer science articles. o c. they can you understand what you read. o d. they can you avoid reading altogether.