[坎贝尔生物学 第924页] Campbell Biology 12th Edition
Figure 40.3 Direct exchange with the environment. Image: A diagram showing two simple organisms, an amoeba a single-celled organism on the left exchanging direc
Figure 40.3 Direct exchange with the environment. Image: A diagram showing two simple organisms, an amoeba a single-celled organism on the left exchanging direc