You will also like...
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..
Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..