Roy is testing different types of soils to see how well corn will grow in them. he fills 2 pots with 2 types of soil and plants the same corn in each. he gives them each the same amount of water and sunlight. each day he measures how tall the corn sprouts have grown.

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

How does natural selection change thephenotypes within a population over time?

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these