A cactus needle is a structure made of different tissues that work together to
protect the plant from animals that might want to eat it. What level of body
organization does a cactus needle represent?
O
A. Cell system
O
B. Organ
O
c. Body system
D. Cell

Fossil found in strata reveal that unused body part decrease in size

Mars and earth have quite a few things in common. both are  terrestrial planets, both are located within the sun’s  habitable zone, both have  polar ice caps, similarly  tilted axes, and similar  variations in temperature. and according to some of the latest scientific data obtained by rovers and atmospheric probes, it is now known that mars once had a  dense atmosphere  and was covered with  warm, flowing water.