Invertebrates are the most commonly found fossils because they:

have hard shells which preserve well
die more often than vertebrates
are buried deeper than other organisms
secrete oxygen which petrify their bodies

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the woman’s offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction

The table lists the observations students made about four specimens under a microscope. based on these observations, what specimens did the students examine? animal plant virus prokaryote cell membrane present ribosomes present lysosomes present nuclear membrane present cell wall present ribosomes present nuclear membrane absent cell wall present ribosomes present nucleus present large vacuole present reproduces inside of a cell nucleus absent rna present 2019 edmentum all rights reserved intl