Answer:
there are no factors
Explanation:
Persons suffering from pain disorder suffer from chronic pain for which no physical cause can be found.
Answer;
- rise of chemoautotrophs and photoautotrophs
- rise of cyanobacteria - a specific type of phototroph that shares homology with chloroplast genome
- rise of eukaryotes
- rise of multicellularity
- rise of bryophytes - mosses
- rise of gymnosperms - conifers, cycads & ginkgo
- rise of angiosperms - flowering plants
Explanation;
Plants are multicellular organisms that have evolved the ability to live on land. The vast majority can carry out photosynthesis, but they are not the only organisms with this ability: many protists can photosynthesize too, as can several important groups of bacteria.
Plants are thought to have evolved from a class of freshwater green algae called the charophytes. Two particular groups of charophyte, the Coleochaetales and the Charales, resemble the earliest land plants (bryophytes) in a variety of ways, including the structure of their chloroplasts and sperm cells, and the way their cells divide during mitosis .
Answer:
Although the nervous system is very complex, there are only two main types of cells in nerve tissue. The actual nerve cell is the neuron. It is the "conducting" cell that transmits impulses and the structural unit of the nervous system. The other type of cell is neuroglia, or glial, cell.
A neurotransmitter
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