Behaviors which sacrifice reproductive success or even survival can actually increase fitness if they promote the survival and reproduction
of close relatives who share a significant proportion of the same
genes. This is known as

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits