最早的有性繁殖生物是自由漂浮的浮游生物。
The first organisms that reproduced sexually were free-floating plankton.
像许多有性繁殖的物种一样，人类有特殊的性染色体。
Like many sexually reproducing species, humans have special gonosomes.
和他们的细菌祖先不同，这些细胞具有特殊的结构，其中包括细胞核，和可以进行光合作用的触角。 他们还能进行有性繁殖，这大大的加快了进化的速度。
Unlike their bacterial ancestors, the cells had specialised structures including a nucleus, as well as machinery vital for photosynthesis.
和他们的细菌祖先不同，这些细胞具有特殊的结构，其中包括细胞核，和可以进行光合作用的触角。 他们还能进行有性繁殖，这大大的加快了进化的速度。
Unlike their bacterial ancestors, the cells had specialised structures including a nucleus, as well as machinery vital for photosynthesis.
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