 Odling-Smee (2010) distinguishes two transmission channels: transmission through direct connection during reproduction between the internal environments of parent and offspring and transmission through an external environment. In channel 1, the internal environment, Odling-Smee includes Jablonka’s and Lamb’s genetic and epigenetic inheritance systems, and some kinds of maternal effects. In channel 2, transmission through an external environment, he includes the inheritance of modified selection pressures in the external environments of organisms as a consequence of prior communicative niche construction, and includes Jablonka’s and Lamb’s behavioral and symbolic inheritance systems. All the inheritance systems just mentioned transmit semantic information, according to Odling-Smee. In addition, both transmission channels are used to transmit energy and matter. Cytoplasmic inheritance of various kinds, and some kinds of maternal effects, are considered by Odling-Smee to be energy and material resources transmitted through the internal environment, and traditional ecological inheritance of selection pressures is non-semantic inheritance that is passed through an external environment.