An overview of the insect order hymenoptera - ants, bees, and wasps
By: M E Skeel
Hymenoptera are everywhere. If you want to escape them, you will have to go to Antarctica. They are not only ubiquitous, they are highly diverse in lifestyles even though they are specialised in body form. What are they? All the insects that we know commonly...
Extinct mammals: Agriotherium
By: M E Skeel
Agriotherium is the name of an extinct genus of bears, known as the giant short-faced bears of the family Ursidae. They occur first in Miocene Era deposits estimated to be about 13 million years old. Most appear about five million years ago, when there was...
Types of wild plants which are invasive
By: Greg Spinks
Invasive plants can do serious ecological damage to native plants, insects, marine life and wildlife. Invasive plants, according to the Pennsylvania Department of Natural Resources (DCNR) can be trees, shrubs, vines and grasses, which aggressively dominate the landscape. They are difficult and expensive to...
Commentary on the decline in the number of horseshoe crabs
By: Denise Calaman
There’s a disappearing act going on in the Atlantic Ocean although it is not one of magic. The American horseshoe crab (Limulus polyphemus) predates the dinosaurs and has thrived along the coastline from Maine to Mexico until recently. A lot of Mid-Atlantic beachgoers will...
The debate on Darwin's theory of evolution
By: Christyl Rivers
Evolution is a theory. Also, gravity is a theory. One would not distrust gravity, however, as it does not threaten any notions of theocracy. Gravity is based on the theory of gravitational laws. We trust gravity, so much so, that we rarely even call it...
By: Timothy Trotter
Salvia Divinorum is a psychoactive plant that produces strong hallucinogenic effects when smoked or taken otherwise. Whilst currently legal in most Western countries, there has been a substantial amount of pressure to make the substance illegal, as its effects are usually stronger than that of...
Eukaryotic animal cell structure
By: Tami Port MS
Animals and plants are eukaryotes, composed of cells that have a nucleus, and membrane-bound organelles. But animal cells have a few different features than plant cells.Unlike plants animals are heterotrophs, meaning that they must eat energy originally captured by plants and other autotrophs (photosynthetic...
Christmas 2010: Hottest new biology books for children
By: Srikanth Radhakrishna
Biology is the study of life and living organisms. It is a very vast subject which is further sub divided in to many disciplines like cellular biology, genetics, etc. The subject is very interesting and also offers good career prospects. If your child is showing...
How to properly set up a compound microscope
By: Tami Port MS
There are many difficulties that a microscope user might encounter before even trying to see the specimen. Dirty lenses and problems controlling the light source are common. Here is how to avoid these frustrating scope issues. * Clean All Lenses First * To avoid problems...
How to view specimens using a compound microscope
By: Tami Port MS
The following is a troubleshooting guide to the most common problems encountered when trying to view specimens with a compound microscope.There are many reasons why someone using a compound scope may have difficulty seeing the specimen. Once the microscope is properly set up, and...

 

1 250 251 252 253 254 371