Many ancient cultures, including the ancient Egyptians and ancient Greeks, used specially selected mold and plant materials and extracts to treat infections.

Many medicinal and recreational drugs, like tetrahydrocannabinol, caffeine, and nicotine come directly from the plant kingdom.

Many bees are opportunistic foragers, and will gather pollen from a variety of plants, while others are oligolectic, gathering pollen from only one or a few types of plant.

Many chaparral plant species require some fire cue ( heat, smoke, or charred wood, and chemical changes in the soil following fires ) for germination.

Many members of the legume plant family support nitrogen-fixing symbionts.

Many Roman writers seem to have composed epigrams, including Domitius Marsus, whose collection Cicuta ( now lost ) was named after the poisonous plant Cicuta for its biting wit, and Lucan, more famous for his epic Pharsalia.

Many plants or plant parts are eaten as food.

During this time, Many former employees of the closed Indiana plant moved to Fenton for employment ; so many, in fact, that entire subdivisions of new homes sprang up south of the plant, near what was then US Route 66.

Many children collect funds leading up to this day to plant trees in Israel.

Many of the cultivars have originated from the Connecticut Experiment Station in Hamden and from the plant breeding of Dr. Richard Jaynes.

Many native plant species are used as herbal remedies for a variety of afflictions.

Many of the plant species fed upon by the okapi are poisonous to humans.

Many of the most important groundbreaking scientific and biological discoveries of the tropical animal and plant kingdom originated here.

Many of the crop species are hybrids, and hybridization appear to be an important factor in speciation in some plant groups.

Many herbivores do not fall into one specific feeding strategy, but instead employ several strategies and eat a variety of plant parts.

Many forms of glider ( see below ) may be modified by adding a small power plant.

Many caterpillars are cryptically coloured and resemble the plants on which they feed and may even have parts that mimic plant parts such as thorns.

Many are restricted to one species of plant, while others are polyphagous.

Many species live on dead plant material such as leaves, twigs, or logs.

Many species such as E. melanophloia and E. setosa retain the juvenile leaf form even when the plant is reproductively mature.

Many terrestrial plant species are endangered as a result of soil eutrophication, such as the majority of orchid species in Europe.

Many species have leaves with structures that attract ants that protect the plant from herbivore insects ( a form of mutualism ).

Many plant species native to arid biomes have adapted so that their flowers only open at night when the sun's intense heat can't wither and destroy their delicate, moist blossoms.

Many cells, bacteria, and other microorganisms are transparent to visible light and must be stained for microscopic investigation.

Many of the cells and microorganisms which are transparent to visible light, absorb or reflect the much shorter wavelengths of the ultraviolet spectrum.

Many protists also exist as individual amoeboid cells, or take such a form at some point in their life-cycle.

Many types of specialized plasma membranes can separate cell from external environment: apical, basolateral, presynaptic and postsynaptic ones, membranes of flagella, cilia, microvillus, filopodia and lamellipodia, the sarcolemma of muscle cells, as well as specialized myelin and dendritic spine membranes of neurons.

Many green algae, such as the Dasycladales encase their cells in a secreted skeleton of calcium carbonate.

Many cells have only a single mitochondrion, whereas others can contain several thousand mitochondria.

Many neurons have only one axon, but this axon may — and usually will — undergo extensive branching, enabling communication with many target cells.

Many of the features found in human ovaries are common to all vertebrates, including the presence of follicular cells, tunica albuginea, and so on.

Many argue that these are not themselves alive in the traditional sense, but these structures exhibit many of the characteristics of cells accepted as living cells:

Many transcription factors, especially some that are proto-oncogenes or tumor suppressors, help regulate the cell cycle and as such determine how large a cell will get and when it can divide into two daughter cells.

Many neurons in the rat and mouse hippocampus respond as place cells: that is, they fire bursts of action potentials when the animal passes through a specific part of its environment.

Many cells can completely undergo interphase without centrioles.

Many cyanobacteria even display the circadian rhythms that were once thought to exist only in eukaryotic cells ( see bacterial circadian rhythms ).

Many cells also possess a calcium ATPase, which can operate at lower intracellular concentrations of calcium and sets the normal or resting concentration of this important second messenger.

Many lichens reproduce asexually, either by vegetative reproduction or through the dispersal of diaspores containing algal and fungal cells.

Many bacteria can be found deep in the mucus, which is continuously secreted by mucus-secreting cells and removed on the luminal side.

Many starfish also possess individual photoreceptor cells across their bodies and are able to respond to light even when their eyespots are covered.

Many cells bind to components of the extracellular matrix.

Many cells possess these receptors, and the binding of an agonist will generally cause a sympathetic ( or sympathomimetic ) response ( e. g. the fight-or-flight response ).

Many forms of cutaneous and mucosal allergy are mediated for a large part by mast cells ; they play a central role in asthma, eczema, itch ( from various causes ) and allergic rhinitis and allergic conjunctivitis.

Many cancer cells are considered ' immortal ' because telomerase activity allows them to divide virtually forever, which is why they can form tumors.

Many pre-invasive lesions in cases of squamous cell carcinoma often regress after long-term reduced exposure of the affected cells and tissues to the original environmental carcinogenic stimulus, such as that seen after long-term abstention from tobacco smoking.

Many are asymmetrical, the cells twisting sideways and then untwisting again prior to division, which often takes place within cysts.