Sharks, whales, and dolphins share similar features such as body shape and the position of fins. However, sharks have gills for breathing, while whales and dolphins have lungs. These differences indicate that the organisms share a common ancestor for(blank) Whales also possess a vestigial pelvic bone. The presence of the pelvis bone may indicate that whales(blank) Blank 1 -body structure, but their breathing structures evolved from different ancestors -both body structure and breathing structure8s -breathing structures, but their body structure evolved from different ancestors Blank 2 -have legs inside their bodies -evolved from organisms with legs -will have legs in the future

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.

answerbacterium;