D). Carcinogens are chemical factors in an organism's environment that can cause spontaneous mutation.
Producer would be missing vital nutrients
Would be missing ammonia
Please mark my answer as brainliest
Birds have a hard time in cold weather, because their body temperatures are higher than those of humans They provide warmth and insulation against colder temperatures. Many birds grow extra feathers in the months leading up to colder weather, so that they'll stay warmer when temperatures drop.
I think it is
D.depilitative