Cycadophyta is a group of plants with a small number of extant species, that is nevertheless well known from fossils from the mesozoic era. living "cycads" are nearly identical to fossils. what best explains these "living fossils"?
a. biological homology
b. punctuated equilibria
c. phylogenetic niche conservatism
d. passive trends
e. hopeful monsters

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

Regarding most of the narrator’s story, which word best describes the tone?

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.