Aeukaryote is an organism with complex cells, or a single cell with a complex structures. in these cells the genetic material is organized into chromosomes in the cell nucleus. animals, plants, algae and fungi are all eukaryotes. there are also eukaryotes amongst single-celled protists. unlike unicellular archaea and bacteria, eukaryotes may also be multicellular and include organisms consisting of many cell types forming different kinds of tissue. prokaryotes are singled cell organisms.

Eukaryotes are multicellular organisms which a cell or a plasma membrane

Explanation: Eukaryotes are organisms made of cell or cells that has a nucleus enclosed in a nuclear membrane and has distinct organelles like the endoplasmic reticulum enclosed, defined and organized in a membrane structure while prokaryotic are unicellular, microscopic organisms which no specialised organelles and no distinct nucleus

answer: c). invertebrates lived on earth before vertebrates.

the invertebrates are the organisms which lack a particular vertebral column. these animals were living in aquatic habitat undergone a series of adaptations in the course of evolution. they increased the range of habitat from aquatic to land. these invertebrates undergone several adaptations to transform into vertebrate organisms which have proper vertebral column. the development of features from invertebrates to vertebrate transformation can be observed in fossils found in sedimentary layers.