Many natural ecosystems have been destroyed by human activity. To better manage our remaining natyral ecosystems, we must first understand how the ecosystems are structured.
One way to do this is to determine how the organisms in the ecosystem obtain the matter and
energy they need to survive. The figure shows a simplified food web.
Often, organisms compete with each other for a food source. Which of the following pairs of
organisms compete with each other for food?

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

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

What is used as a template during replication? a- mrna b- trna c- rrna d- dna