Author Question: What is the difference between invertebrate and vertebrate chordates? What organism has ... (Read 45 times)

casperchen82 · **on:** Aug 22, 2018

What is the difference between invertebrate and vertebrate chordates? What organism has characteristics of both?

Question 2

Which statement describes how volcanoes can shape the coastline?
A) Lavas force waves cut through cliffs to form sea caves.
B) Lava flowing seaward from an eruption forms fresh coast exposed to erosion.
C) Volcanic eruptions fall on the ocean floor and form sea stacks.
D) Emptying of volcano chambers resulting in drowned river valleys.

macybarnes · **Reply #1 on:** Aug 22, 2018

Answer to Question 1

Chordates, in general, are characterized as having a notochord, a tubular dorsal nervous system, and gill slits at some point in their development.
Invertebrate chordates are organisms that have lost their notochord as they developed.
Vertebrate chordates have the unique characteristic of the stiffening backbone. They also have internal skeletons made of calcified bone or cartilage. Skeletons gave protection to organs, a foundation for muscles, and uninterrupted support during growth.
Amphioxus is the transitional species from invertebrate to vertebrate. It swims by undulating its body much like a fish while combing the water for food. Its well developed dorsal nerve chord is similar to a vertebrate's spinal cord.

Answer to Question 2

B