PLEASE HELP Octopus, squid, and nautilus are examples of arthropods.
a. true
b. false
17
Sponges belong to the phylum Porifera.
a. true
b. false
18
The phylum Nematoda includes the flatworms.
a. true
b. false
19
Sea anemones are polyps that are members of the plant kingdom.
a. true
b. false
20
Mollusks are soft-bodied invertebrates that typically have inner or
outer shells.
a. true
b. false

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem