You don't need the "and", in this case, it is already assumed by DarwinBots. You would need it, however, if you were doing more complex functions or using "or"... for example
cond
*.nrg 1000 >
*.body 100 >
and
*.nrg 10000 >
*.body 10 >
and
or
start
30 .repro store
stop
The bot would then reproduce under those 2 conditions. There would be other ways to that condition more efficiently, though.