Answer:
symbiotic
Explanation:
symbiotic relationships benefit both organisms
The whale still has traces of a hip and pelvis bones in the back of his body witch scientist think they used to walk on land
Red blood cells, also known as RBCs, red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes, are the most common type of blood cell and the vertebrate's principal means of delivering oxygen to the body tissues—via blood flow through the circulatory system. RBCs take up oxygen in the lungs, or gills of fish, and release it into tissues while squeezing through the body's capillaries.
this is about red blood cells but what are you asking
Well trees and live animals well be affected
True ..In animals, the female mitotic sequence produces only one ovum; the other three haploid cells become "polar bodies".