« previous next »
« previous next »
 

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Did you know?

Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

Did you know?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Food Chain Food Chain
Sources and Amounts of Oil Released into North American Marine Waters Sources and Amounts of Oil Released into North American Marine Waters
Types of pathogenic organisms: (a) bacterium, (b) virus, (c) protozoan pathogens, (d) multicellular ... Types of pathogenic organisms: (a) bacterium, (b) virus, (c) protozoan pathogens, (d) multicellular ...
Speciation produces new types of organisms Speciation produces new types of organisms
Factors in Food Security Factors in Food Security
Gui (grilled food) Samgyeopsal gui Gui (grilled food) Samgyeopsal gui
Video: Origin of organelles Animation

For a complete list of videos, visit our video library