Question

can you answer these
Why was modern classification invented?
Traditional classification could not classify all living things.
Scientists realized related organisms do not share similar characteristics.
Scientists understood that species share a common ancestor.
Modern classification is faster and easier to use.

Which describes the modern classification system?
based on evolutionary relationships
called Linnaean classification
based on similar appearances
called Darwinian classification

A scientist is trying to determine how closely related a moth species (Species Z) is to four other moth species (Species A, B, C, and D). He examined the DNA of each species and compared it to the study subject. He then created this table.

Species
# of genetic differences
Species A
12
Species B
3
Species C
14
Species D
28

Which species is most closely related to the moth species (Species Z)?
species A
species B
species C
species D

Consider the cladogram.

A cladogram is shown. Mollusks, echinoderms, chordates, and annelids have roundworms as a common ancestor.

According to the cladogram, which organisms have roundworms as a common ancestor?
mollusks and flatworms
sponges and chordates
flatworms, sponges, and cnidarians
mollusks, echinoderms, chordates, and annelids

In a cladogram, what occurs at a node?
A derived trait appears.
Evolution is stopped.
An ancestor dies.
The cladogram ends.

Answer 1

Here are the answers with brief explanations:

1) Why was modern classification invented?
- Scientists understood that species share a common ancestor.
(Modern classification groups organisms by evolutionary relationships.)

2) Which describes the modern classification system?
- based on evolutionary relationships

3) Which species is most closely related to Species Z?
- species B
(It has the fewest genetic differences: 3.)

4) According to the cladogram, which organisms have roundworms as a common ancestor?
- mollusks, echinoderms, chordates, and annelids

5) In a cladogram, what occurs at a node?
- A derived trait appears.
(Nodes mark branching points where a common ancestor and new derived trait/lineage arise.)