All vertebrate embryos have a notochord, or a long rod that runs through the body just below the nerve cord. As the embryo develops, only jawless fish retain the notochord. What does this indicate about the evolution of vertebrates?

What organelle is analogous (same as) to a stomach in a stentor and other protists?

Are hermit crabs unicellular or multicellular

How much methane may be locked up in sediment containing gas hydrates

List two functions of organic compounds

Why are leaves green? a. chlorophyll molecules mainly absorb light in the ultraviolet and red-orange part of the electromagnetic spectrum. chlorophyll does not absorb much green light, which is reflected to our eyes. b.

How the structure of DNAallows it to serve as the basis for inheritance?

Where does DNA replication happen?

Within a forest ecosystem, the habitat of a fern would be ... . A. the tree that casts the shadow in which the fern grows. b. the decaying plant material which provides nutrients for the fern. c. the soil and the space occupied by the fern leaves. d.

Laboratory stations are usually divided into clean and dirty areas, to prevent contamination of paperwork. true false

Is iron oxide located in hydrosphere lithosphere or atmosphere?