Question

they lack paired fins and jaws Question 14 1 pts Humans are classified as protostomes because the opening in the digestive track develops into the anus. True False Question 15 1 pts Which of the following is not true as related to Arthropods? Examples include: horseshoe crabs, millipedes, insects and butterflies. They can be found in a variety of habitats Metamorphosis can be a stage in an Arthropod's life cycle They have an internal skeleton that muscles and bones attach to

Answer 1

1. False

Humans are classified as deuterostomes because the original dent becomes the anus, while the gut eventually tunnels through the embryo until it reaches the other side, forming an opening that becomes the mouth. In protostomes (flies) the original opening develop in to mounth which then develop to anus.

2. They have an internal skeleton to which muscles and bones attach to.

Arthropods have an external skeleton made up of chitin ( exoskeleton). This is to give them mechanical support and protection for the body. They shed ththese exoskeleton time after time and resynthesis new ones.