What distinct difference did 19th century scientists notice between plant and animal cells?

What process allows for the development of haploid sex cells? mitosis meiosis fertilization pollination

Pls ! in your opinion, what are the limiting factors that might affect the growth or diversity of our ecosystem? respond to this question in claim, evidence, reasoning format. 1. make your claim (i are the limiting factors that might affect the growth or diversity of our 2. follow the claim with 3 pieces of evidence. evidence may be taken from the reading, the videos, previous lessons, or googled answers. site sources, too. 3. use reasoning to explain why you chose your evidence.

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.