Help with a science crossword?

I'm doing a crossword puzzle for science and I can't seem to find the answers to a few of them. Could I get some help?

1 Down: at first was cloned using a human hair to split the embryo. [second letter: a, last letter: r.] [10 letters]

5 Down: one readon why clones may appear and act different. [fifth letter: r.] [11 letters]

9 Down: can help prevent yje rejection of transplant organs [third letter: c] [8 letters]

and

10 Down: have the potential to become another type of cell. [second letter: t] [9 letters]

Thanks!

Help with a science crossword?

Here's some ideas:

1 down:

5 down: experiences

9 down:

10 down: stem cells

Sorry i can't help with all of them.

Help with a science crossword?

#1 is SALAMANDER

"In the first few years of the 20th century, Spemann used a baby's hair to split hundreds of salamander embryos in two."

sorry thats all i got