问题详情

Which of the following is true？
A．Scientists have a sound knowledge about the diversity of species.
B．Scientists don"t know much about the number of stars in the galaxy.
C．Scientists show more interest in stars in the galaxy than in species on Earth.
D．Scientists don"t agree on the number of species in the world.请帮忙给出正确答案和分析，谢谢！