Blank are chemical messagners secreted by glands

How does land development destroy ecosystems? it increases human carrying capacity too rapidly. it converts them into residential or agricultural areas. it forces humans to import non-native plants and animals. it expands the natural range of native wildlife species.

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere