Bacteria first appeared 2.5 billion years ago; while tracing the first eukaryote is difficult, animals first emerged 550-650 million years ago. How does this help explain the differences between ribosomes?

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..

Can someone i have no idea of how to do this.

Look at the photo of the leaf, which term best describes this leaf ? a-simple.b-parallel.c-lobed.d-tooth.