glycogen

Glycogen is a polysaccharide that acts as a source of energy storage in animals and fungi. In humans, glycogen is mostly produced and stored...

ethylene

Ethylene (C2H4) is a hydrocarbon and a simple alkene. It is a natural plant hormone which is used in agriculture to force the ripening of ...

epithelial tissue

Epithelial tissue, or epithelium, is one of the four types of animal tissues and it lines the cavities and surfaces of structures on the bod...

heterotroph

Heterotrophs are organisms that cannot fix carbon to survive. Animals, fungi, and many bacteria are heterotrophs.

coevolution

Coevolution is triggered by changes occurring in a related object and it works like a chain of causes and effects. For example, when a prey ...

adaptation of an animal

Animals could adapt in many different ways in order to survive. Some change their appearances, some develop what they already have to increa...

adaptation of a plant

Plants adapt just like animals in order to survive by undergoing changes in their genes. Some plants like cacti have spikes and thorns to wa...

phloem

The phloem is the living tissues in plants and it transports nutrients, such as sucrose, to all parts of the plant. In the picture is a tree...

niche

The niche of an organism is its role in the ecosystem which allows the organism to live and contributes to the functionality of the ecosyste...

endosperm

The endosperm is the tissue that is produced in the seeds of many flowering plants. It is highly nutritious to humans because it could conta...

homeostasis

Homeostasis is the tendency of the internal environment of an organism to remain stable despite the changes in the external environment. For...

commensalism

Commensalism is type of relationship between two organisms in which one benefits without harming or affecting the other. An example would be...

predation

Predation is a biological interaction involving a predator hunting down and consuming a prey. Both predator and prey may adapt by gaining fe...

prokaryote

Prokaryotes are organisms (mostly unicellular) which lacks a membrane-bound nucleus, lysosomes, an endoplasmic reticulum, and a Golgi appara...

fermentation

Fermentation is a metabolic process used to produce yogurt, wine, and many other products which occurs when an organism converts a carbohydr...

unicellular organism

A unicellular organism only have one cell. Examples of a unicellular organism are bacteria, archaea, protozoa, and prokaryotes. Unicellular ...

tropism

Tropism is a natural phenomenon in which plants or any other biological organisms will move or turn due to an external stimuli. Examples of ...

genetic variation within a population

Genetic variation is the differences in the alleles of genes and it creates diversity and contributes to natural selection. It is caused by ...