1/27
Name | Mastery | Learn | Test | Matching | Spaced |
---|
No study sessions yet.
Epithelium
is a layer of tightly joined cells that covers the interior and /or exterior surface of the animal.
Viviparous
" (live- bearing) "species such as humans and most other mammals nourish embryos inside the body and give birth to live young.
Metamorphosis
is a drastic change of form from one developmental stage to another.
Lophotrochozoans
grow continuously when conditions are good.
Spicules
are stiff spikes of silica or calcium carbonate (CaC03) that, along with collagen fibers, give structural support to the ECM.
Ectoparasites
live on the outside of their hosts.
Oviparous
" (egg- bearing) "species such as chickens and crickets deposit fertilized eggs.
Ecdysozoans
grow by shedding their external skeletons or outer coverings and expanding their bodies.
Cephalization
is the evolution of a head, or anterior region, where structures for feeding, sensing the environment, and processing information are concentrated.
Colonies
are groups of individuals that are attached to each other.
large mass of neurons
The that is located in the head, and that is responsible for processing information to and from the body, is called the cerebral ganglion or brain.
sessile polyp
Many cnidarians have a life cycle that includes both a(n) form that reproduces asexually and a free- floating medusa that reproduces sexually.
Herbivores
that feed on plants or algae.
indirect development
During , embryogenesis produces larvae.
evolution of αnimαls
The is more complicated than α smooth transition from simple to complex.
Ovoviviparous
" (egg- live- bearing) "species such as guppies and garter snakes retain eggs inside the body during early development, but the growing embryos are nourished by egg yolk instead of by nutrients transferred directly from the mother, as in viviparous species.
germ layer
In triploblasts, however, there is a(n) called mesoderm " (middle- skin) "between the ectoderm and endoderm.
multicellular eukaryotes
All animals are whose cells lack cell walls but have an extensive extracellular matrix (ECM)
Sponges
do not have complex tissues, groups of similar cells that are organized into tightly integrated structural and functional units.
Endoparasites
live inside their hosts and usually have simple, wormlike bodies.
Cnidarians
have nerve cells at are mostly organized into a diι fuse arrangement called a nerve net.
Segmentation
is defined as the division of the body or a part of the body into a series of similar structures.
radiation of animals
The began around 550 million years ago during an event called the Cambrian explosion.
embryonic tissues
The are organized in layers, called germ layers.
diploblasts
In 1ese germ layers are called ectoderm " (outer skin) "and endoderm ("inner- skin)
Cambrian explosion
The radiation of animals began around 550 million years ago during an event
benthic
they live at the bottom of aquatic environments
sessile
adults live permanently attached to a substrate rather than moving freely