It is impossible to tell from the data provided. How many times has blastopore fate changed over the course of evolution? Multiple times, though the exact number is uncertain.
Which of the following statements best represents evidence supporting the leading hypothesis regarding the evolution of jaws in vertebrates? Both jaws and gill supports are derived from the same type of specialized embryonic cells. Which statement about deuterostomes is correct?
What is the correlation between miRNA diversity and animal complexity? miRNA diversity and animal complexity are positively correlated.
The origin of all extant animal phyla can be traced to the Cambrian explosion. Most animal phyla belong to the clade Radiata.
Which of the following statements correctly describes a characteristic of the phylum Platyhelminthes? They typically reproduce asexually.
Terms in this set (12) The animal phylum most like the protists that gave rise to the animal kingdom is ___. Porifera. (Evidence that supports this includes the lack of true tissue in sponges and the close similarity between choanocytes and choanoflagellates.)
What is the key difference between a coelom and a pseudocoelom? A coelom is a true body cavity, whereas a pseudocoelom is a false coelom that is not fully functional. Only a coelom is fully lined with mesoderm tissue. Pseudocoeloms arose early in animal evolution and evolved into coeloms.
Deuterostomes have indeterminate development. Most deuterostomes have indeterminate cleavage, meaning that each cell produced by early cleavage divisions retains the capacity to develop into a complete embryo.
All animals (including humans), plants and other organisms such as fungi and algae are Eukaryotes and share a common ancestor.Mar 18, 2011
The origin of all extant animal phyla can be traced to the Cambrian explosion. Sponges are diploblastic animals. All animals share a common ancestor. Most animal phyla belong to the clade Radiata.
Note: Both flatworms and roundworms can be parasitic or free living. But flatworms have hooks and suckers for adhesion on their host....What is the difference between flatworms and roundworms?FlatwormsRoundwormsThey are mostly hermaphrodites.They are dioecious or unisexual and always show sexual dimorphism.5 more rows
Habitat. Most freshwater flatworms are free-living and can be found in ponds, lakes, streams, ditches, and temporary puddles. They live under rocks, plants, and debris to avoid direct sunlight. They can be found on hard and soft substrates, but are more common on the hard surfaces.
Explanation: Arthropods have segmented bodies, like the annelid worms.Feb 20, 2020
contraction of a series of muscles along the notochord, adults bury themselves into the sediment of the seafloor, and all chordate characters. present in adults. -tunicates- most chordate characters. not present in adult, in adults, water enters through one siphon and leaves through another, and larvae swim using.
Select the correct statement about the evolution of animals. the oldest generally accepted fossils of large animals range in age from 565 to 550 million years old. Select the correct statement (s) about animal body plans.
Triploblastic animals have three germ layers (ectoderm, mesoderm, and endoderm) and three basic body plans related to body cavities (acoelomate, pseudocoelomate, and coelomate). -In a coelomate, the tissue lining the inner side of the body cavity arises from the same germ layer as the tissue lining the outer side of the body cavity.
Only a coelom is fully lined with mesoderm tissue. Depending on the blastopore fate of its members, label each branch with P (for protostomy), D (for deuterostomy), N (for neither), or P & D. Labels may be used once, more than once or not at all. Acoela- N. Echinodermata- D.
Many animals can be categorized as either protostomes and deuterostomes based on certain features of their embryonic development. Determine whether each of the following terms applies to only protostomes, only deuterostomes, both protostomes and deuterostomes, or neither.
Among the characteristics unique to animals is a. gastrulation. b. multicellularity. a. gastrulation. b. multicellularity.
The distinction between sponges and other animal phyla is based mainly on the absence versus the presence of a. a body cavity. b. a complete digestive tract. c. mesoderm. d. true tissues.
Which of the following was probably the least important factor in bringing about the Cambrian explosion? a. the emergence of predator-prey relationships b. an increase in the concentration of atmospheric oxygen c. the movement of animals onto land d. the origin of Hox genes
Based on the tree in Figure 32.11, which statement is false? a. The animal kingdom is monophyletic. b. Acoelomate flatworms are more closely related to echinoderms than to annelids. c. Sponges are basal animals. d. Bilaterians form a clade.
A professor begins a lecture on animal phylogeny (as shown in Figure 32.11 ) by saying, "We are all worms." In this context, what did she mean?
Redraw the bilaterian portion ofFigure 32.11 for the nine phyla in the table below. Consider these blastopore fates: protostomy (mouth develops from the blastopore), deuterostomy (anus develops from the blastopore), or neither (the blastopore closes and the mouth develops elsewhere).
Animal life changed greatly during the Cambrian explosion, with some groups expanding in diversity and others declining. Write a short essay (100-150 words) interpreting these events as feedback regulation at the level of the biological community.