Agricultural pests

right|thumb|Weeds growing in the cracks of a concrete staircase (Epilobium roseum, [[Chelidonium majus, Oxalis corniculata, Plantago major)]]

Species of amphibian

Pocket gophers, commonly referred to simply as gophers, are burrowing rodents of the family Geomyidae. The roughly 41 species are all endemic to North and Central America. They are commonly known for their extensive tunneling activities and their ability to damage farms and gardens.

small underground mammal feeding on larvae and insects

species of bird

species of bird

species of mammal

efforts to stop or reduce the growth of weeds

species of plant

Wikimedia list article

species of plant

weed that has been designated by an agricultural or other governing authority as a plant that is injurious to agricultural or horticultural crops, natural habitats or ecosystems, or humans or livestock

thumb|321x321px Cross-resistance is when something develops resistance to several substances that have a similar mechanism of action. For example, if a certain type of bacteria develops antimicrobial resistance to one antibiotic, that bacteria will also have resistance to several other antibiotics that target the same protein or use the same route to get into the bacterium. A real example of cross-resistance occurred for nalidixic acid and ciprofloxacin, which are both quinolone antibiotics. When bacteria developed resistance to ciprofloxacin, they also developed resistance to nalidixic acid b