In which of the following periods of the paleozoic era did the first vascular plants appear on land?
a. silurian
b. permian
c. cambrian
d. ordovician

Which process is involved in growing crops? irrigation transportation recreation condensation

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?