The equivalent of the mammal Y chromosome that is found in birds, like the comparison of X and Z chromosomes respectively.

A behavioural occurrence in bees that is a way for bees to communicate with one another. They "waggle" their tails to signify to their hive that they have found food. The rest of the workers can interpret this dance and fly the most direct route to the food.

See Homeotherm

The liquid that equals more than 60% of our body matter, and is an essential component of an environment capable of supporting life. Water freezes to a solid at zero degrees Celsuis and boils to a liquid at one hundred degrees celsius. In between, it exis.

Phenotypical characteristics that exhibit dehydration in the plant, like browning leaves due to the lack of water required to keep cell concentrations at an acceptable and healthy level.

The level of water that is equally spread across the landscape which may be under of above ground. The water table exists under dry land, though when the altitude of the land decreases, the water table is close to the surface. If the level of the water table exceeds the altitude of the ground, then a lake will form.

The creation of a waterproof layer in nature, usually involving a layer of water repelling phospholipid molecules. An example of this is in waxy leaves in plants where water can easily run off them, this is an example of waterproofing via a waxy cuticle.

A measurement between two successive points of a wave, which can be used to measure things like light and sound. The wavelength of lights' visible to the human eye range from violet (400 nanometres) to red (750 nanometres).

A type of fat

Plants that are considered a "nuisance" to man because they compete for resources in the same local environment as the crops we intend to grow for our own species. The weed may actually indirectly helping the crop by diverting pathogens that may otherwise.

See leucocyte