skills to developIdentify the most common acellular pathogens that can cause infections of the nervous systemCompare the major characteristics of specific viral diseases affecting the nervous systemA number of different viruses and subviral particles can cause diseases that affect the nervous system.
The Bryophytes (~23,000 extant species)Bryophytes arose in a period of Earth’s history before soils had formed. As green algae began to colonize the terrestrial surface, at least one of these lineages accumulated adaptations that were favorable to living on land--a waxy cuticle to prevent water loss, desiccation-resistant dispersal propagules called spores, and retention and feeding of the developing zygote.
Your limbs first begin growing as a small nubbin off your torso. As cells proliferate, a small rod of skeletal tissue begins to grow right in the middle. This will become the humerus or femur. This skeletal tissue is specified early on by Sox9, a transcription factor also involved in sex-determination.