photoperiodism

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H1N1 influenza virus particles. Colorized transmission electron micrograph. Surface proteins on surface of the virus particles shown in black. Influenza flu

10 Ways of Looking at Cells

Endoplasmic reticulum. cell biology

6 Cell Organelles

Science studient dissecting frog

Pro and Con: Animal Dissection

Discover

Fish. Lionfish. Lion-fish. Turkey fish. Fire-fish. Red lionfish. Pterois volitans. Venomous fin spines. Coral reefs. Underwater. Ocean. Red lionfish swims by seaweed.

10 of the World’s Most Dangerous Fish

illustration of the walking titanosaurus, Patagotitan mayorum

Titanosaurs: 8 of the World's Biggest Dinosaurs

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Titanic infographic. The 30th anniversary of its discovery is September 1, 2015. SPOTLIGHT VERSION.

Timeline of the Titanic’s Final Hours

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Easter Procession of Maria Santisima del Sacromonte in Granada, Spain. This statue is known as Virgen de los Gitanos or The Virgin of the Gypsies.

What is Holy Week?

Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England

7 of the World’s Most Dangerous Festivals

photoperiodism: Related Content

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Topics

How Do Birds Know When to Fly South?biological clock biological periodicity stimulus-response behaviour stereotyped response instinct reflex fight-or-flight response biological rhythm adjustment