invertebrate phylum first to submit a complete digestive tract?

cnidarians, annelids, nematodes, arthropods Which of the following is an example of a mollusk? arachnids, oysters, snails, squid, the following characteristics is unique in the phylum of arthropods, compared with other invertebrates: exoskeletons, open systems of the circulatory system, jointed appendages, segmented bodies following categories are the main arthropod aquatic insects, arachnids, crustaceans, centipedes, which of the following animals is not an arachnid? iron horse crab, scorpions, beetles

The phylum of invertebrates first to submit a complete digestive tube is? Which of the Nematoda The following is an example of a mollusk? Which Arachnid the following characteristics is unique in the phylum of arthropods, compared with other invertebrates? Which of the following are arthropods exoskeletons mainly aquatic crustaceans Which of the following animals is not an arachnid? Beetle

Bugs.

can spiders drown to death?

I know that insects can’t have water in their respiration system or else they can’t respirate, and end up dying. I was wondering.. is that the same for spiders? cause spiders are arachnids.. hm…

Spiders also drown. They have respiratory systems that use what are called ‘book lungs’ which, as you’d probably guess are book shaped, similar to bellows. And yes, they require air to survive.

There is an interesting spider that goes underwater but it takes with it a bubble of air trapped in a web so that it can breath.

Arachnids, Spiders and Their Allies (Highlights) – 1948