TF阅读真题第844篇Climate Change and Species Distribution

TF阅读真题第805篇Concealing Coloration

TF阅读真题第817篇The Runaway Greenhouse Effect on Venus

Why Did Agriculture Arise   Sometime around 10,000 years ago, some hunter-gatherers took up agriculture. Though the advantages may seem obvious, there are also disadvantages: ...

Agricultural Origins   It is tempting to think that people started domesticating plants and animals because hunting and gathering was laborious and then someone had the brilli...

Parental Care by Frogs Only an estimated 10 percent of anuran (frog and toad) species provide any kind of parental care. But within this 10 percent there is very great diversity ...

TF阅读真题第854篇Why Did Social stratification Emerge

TF阅读真题第855篇Thermoregulation in Marine Mammals

TF阅读真题第849篇Azolla and Climate in the Arctic and Europe

The Azolla Event     During the early Eocene period, about 56 million years ago, Earth's atmosphere had high levels of carbon dioxide(CO2) which warmed the planet. But a...