A hiker finds a smooth, rounded pebble along the shore of a stream that is flowing down from a mountain. Which of these most likely caused the pebble to have this appearance?

A, b,c or d !?
PLS I NEED HELP

Select the correct answer. which formula describes newton’s second law of motion? a. force=mass x accerlaration b. mass/accerlaration c. mass x volacity d. mass/ volacity

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

Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with "basking lights" which act as an artificial sun. describe how the three methods of thermal energy transfer may take place within the iguana's enclosure.