a. annelida
b. arthropoda
c. mollusca
d. echinodermata
e. nematoda Answer= b. arthropoda
Living things without a backbone are classified as invertebrates. This group includes a wide range of organisms such as insects, worms, jellyfish, and mollusks. Invertebrates make up the majority of animal species on Earth.
Invertebrates first appeared on Earth over 550 million years ago during the Ediacaran period. These early invertebrates were simple organisms without backbones and laid the foundation for the diverse array of invertebrate species that exist today.
The test of a species' successful interbreeding is whether offspring are produced that are viable and fertile. Viable offspring are able to survive and reproduce, thus ensuring gene flow between the parent species.
Most of the animals alive today are invertebrates, such as insects, spiders, and worms. Invertebrates make up about 97% of all animal species on Earth. They play important roles in various ecosystems as pollinators, decomposers, and prey for other animals.
Squid are invertebrates. This is because they do not have a backbone.
Insects, easily. They account for about 75% of the entire animal kingdom, including vertebrates! ^^
I do not know if there is an exact percentage, but I do know that the of the known species, the most are invertebrates. This is because bugs are invertebrates. There are so many different species of bigs, just the insects alone, that we cannot find and name them all. Also you have many other groups of invertebrates.
invertebrates
3,274,967 species of invertebres have been found
All species of flies are invertebrates.
Approximately 95% of known species of animals are invertebrates.
Different species cannot breed with each other because they have different numbers of chromosomes and genetic makeup, which prevents successful reproduction.
Invertebrates make up about 95% of the total number of species; the remaining 5% are vertebratesyes there are definetly more inverdibrates especialy considering how many insects there are and microorganisms the name for how many animals in a biome or area is called biodiversity in case you are doing a project so if you would like to find the biodiversity of a biome now you know what to look for.There are more species of invertebrates than vertebrates. About 97% of all animal species are invertebrates.
It depends on the species. If it's endangered, there could be only a few (single numbers maybe to 100's or 1000's). If it is a very successful species like humans, there are around 7 billion humans on earth.
All birds, regardless of species, are vertebrates
Platypuses do not "threaten" other species. Platypuses feed on a variety of small invertebrates, but they do not threaten these species, as the creatures are plentiful.
Witchetty grubs are invertebrates. They are the larvae of various species of moths, particularly those in the family Cossidae, and belong to the class Insecta. As invertebrates, they lack a backbone and have an exoskeleton, which is characteristic of insects.