主要内容
生物
学习生物前的准备
生物学的基础是化学, 数学和物理. 了解如何为学好生物学做最佳准备.
Biology is brought to you with support from the Amgen Foundation
If you're seeing this message, it means we're having trouble loading external resources on our website.
如果你被网页过滤器挡住,请确保域名*.kastatic.org 和 *.kasandbox.org 没有被阻止.
