Animal Biology: Molluscs and Annelids Quiz

A group of animals that share a common ancestor. It includes all descendants of that ancestor.

A type of development where the anus forms first, followed by the mouth. This is a defining characteristic of deuterostomes.

A unique water vascular system used for locomotion. It's found in echinoderms.

A rod-like structure that provides support and helps with movement in chordates. It lies along the dorsal side of the animal.

They are bilaterally symmetrical and have a worm-like body with gill slits. They belong to the deuterostome lineage.

A group of animals characterized by their dorsoventrally flattened bodies. They lack a coelom.

A cavity that connects to the mouth of a flatworm and serves for both digestion and distribution of nutrients.

A type of parasitic flatworm that lacks a mouth and gastrovascular cavity. Instead, it absorbs nutrients from its host's intestine.

A group of invertebrates that includes snails, slugs, clams, oysters, squids, and octopuses.

A protective, hard outer layer made of calcium carbonate, present in many molluscs.

A muscular structure used for movement in molluscs.

The central part of a mollusc's body containing its internal organs.

A fold of tissue that covers the visceral mass and secretes the shell.

A specialized, rasp-like organ used for feeding in many molluscs.

A type of coelom that is the main body cavity in molluscs.

A group of segmented worms with a true coelom.

Protective membrane surrounding the embryo, containing amniotic fluid for cushioning.

A sac that collects and stores metabolic waste produced by the embryo.

A sac containing yolk, a nutrient-rich source for the developing embryo.

Scales are made of keratin, providing protection against desiccation and abrasion.

Adaptation that allows for internal fertilization, crucial for reproduction on land.

Adaptation of the tetrapod forelimb for flight, characterized by lightweight bones and feathers.

Nourishment of young mammals through milk production.

The notochord is present during the embryonic stage and disappears as a more complex skeleton forms.

Extensions of the water vascular system that function in locomotion, feeding, and sensory perception.

A group of animals including vertebrates, cephalochordates (lancelets), and urochordates (tunicates).

Cephalochordates and urochordates are invertebrates that are more closely related to vertebrates than other invertebrates.

Bilaterally symmetrical animals that belong to the Deuterostomia clade.

The phylum Chordata is a diverse group that includes vertebrates, cephalochordates (lancelets), and urochordates (tunicates).

A specialized bone structure in humans that allows for more precise manipulation of the thumb, compared to the 'power grip' found in other primates.

The study of human origins, focusing on the evolution and development of human ancestors.

A group of extinct species closely related to humans, but not chimpanzees, providing insights into human evolution.

An extinct hominin species that lived approximately 6.5 million years ago, offering early clues about human evolution.

The hole at the base of the skull where the spinal cord connects. Its position in early hominins suggests an upright, bipedal stance.

The ability to walk upright on two legs, a key characteristic distinguishing humans and their ancestors from other primates.

The anatomical features that distinguish humans from other living species, such as bipedalism, larger brains, and tool use.

A tail adapted for grasping, found in New World monkeys, allowing them to swing through trees.

The common ancestor of humans and chimpanzees was not a chimpanzee, but a separate ancestor that gave rise to both lineages.

Refers to the outward projection of the jaw.

The genus Homo includes all species that belong to the human lineage, including modern humans (Homo sapiens).

Groups of similar cells that work together to perform a specific function within an organism.

A specialized type of tissue that transmits signals throughout the body.

The ability of an organism to maintain a stable internal environment despite changes in the external environment.

The process by which a sperm cell and an egg cell fuse to create a diploid zygote.

The evolutionary grouping of all animals, indicating that they all share a common ancestor, forming a single lineage.