If motility is considered a characteristic of animals, why are stationary creatures likesponges and crinoids still considered to be animals?
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Between the organs and the body wall, complex animals have a body cavity called aA) cnidarian.B) coelom.C) mesoderm.D) thorax.E) mesoglea.
Which of the following characteristics is associated with all animals that are bilaterallysymmetrical at some point in the life cycle?A) coelomB) mesodermC) cephalizationD) lack of organsE) gastrovascular cavity
Segmentation is important in the evolution of animals becauseA) it allows them to be bigger.B) it increases the number of tissue layers present.C) it allows for specialization of function.D) A and BE) B and C
How can flatworms survive without a respiratory system?A) They are flat, allowing diffusion of gases directly to and from cells.B) They are small, allowing diffusion of gases directly to and from cells.C) They are not very metabolically active, and there is no need for a more efficient means ofgas exchange.D) They have a thin, moist covering that facilitates gas exchange.E) All of these are true.
The taxonomic group containing the largest and most intelligent invertebrates isA) Aves.B) Cephalopoda.C) Uniramia.D) Gastropoda.E) Chordata.
Which of the following phyla contains animals that reproduce asexually?A) PlatyhelminthesB) NematodaC) MolluscaD) CnidariaE) Annelida
The leeches used by doctors to prevent blood clotting and stimulate blood vessel growth inpatients recovering from reconstructive surgery are members of the phylumA) Cnidaria.B) Platyhelminthes.C) Annelida.D) Nematoda.E) Arthropoda.
All chordates have ________.A) pharyngeal gill slitsB) bilateral symmetryC) a fully lined body cavityD) a dorsal, hollow nerve cordE) all of the above
Which of the following features do humans share with other chordates?A) Humans have a nerve cord.B) Humans develop a tail in early development.C) Humans develop a notochord in early development.D) Humans develop gill slits in early development.E) Humans have all of these features.