Animals that do NOT have a spinal column or backbone are:

Animals that feed on small food particles or organisms suspended in water are:

Animals that feed on dead bodies of other animals are:

The skeleton in invertebrate animals is called:

A characteristic of porifera is:

The animal in the picture belongs to the group of:

The group of invertebrates that has stinging cells is:

An example of cnidarians in polyp stage is a:

The group of invertebrates that has no legs, so they move by using rigid, hair-like structures called setae is:

In moluscs, the body is enveloped in a thin membrane called:

The group of moluscs that has a shell in one piece and spiral shaped is:

Gastropods have a toothed tongue inside the mouth called:

The group of moluscs that has a shell formed by two parts (valves) joined by a dorsal hinge is:

Squids and octopuses belong to the group of:

The largest group of living things is:

Arthropods have to shed their exoskeleton as they grow in a process called:

The only group of arthropodos that can have wings is:

The group of arthropodos that is exclusively aquatic is:

Centipeds and millipeds belong to the group of:

The animal in the picture belong to the group of:

The water vascular system that helps echinoderms to feed and move formed by tube feet which have suction pads at the tip is called:

Invertebrate animals are important for (mark all the ones that you think that are correct):

The main characteristic of vertebrates is:

Fish have a body shape that is wider in the middle than at the end called:

Lateral line in fish detects:

If an animal is poikilothermic, that means that:

If the embryo develops inside an egg inside the mother’s body, that animal is:

If the gametes join in the environment, outside the female’s body, we called that:

Fish take oxygen from the water with their:

Gills are protected by an operculum in:

Sharks and rays belong to the group of:

The changes that amphibians' newborns have to suffer to become adults are called:

Young amphibians breathe through:

Amphibians without tails such as frogs belong to the group of:

Salamanders belong to the group of:

Tortoises and sea turtles belong to the group of:

Reptiles that have long bodies with no limbs belong to the group of:

Depending on the type of food that the bird eats, they have different shape in:

Birds have a kind of bags filled with air between organs and inside the bones called:

As birds can regulate their body temperature independent of their environment, we say they are:

The only groups of vertebrates that are homeothermic are (mark all the ones that you think that are correct):

For providing thermal insulation, mammals have:

The only group of vertebrates with external ears is:

The group of mammals in which embryos develop inside the mother and feeth through the placenta is:

The group of mammals in the young develop in an external pouch where the mammary glands are located is:

The only oviparous mammals are:

Human beings belong to the order of:

In human beings, upper limbs are arms that end in hands with a:

Vertebrate animals are important for (mark all the ones that you think that are correct):

An ecosystem consists of (mark all the ones that you think that are correct):

Very large ecosystems are called:

All the ecosystems on the Earth form the:

The physical environment or non-living component of an ecosystem is the:

All the psysical factors that can be identified, measured and described in a biotope are the:

Individuals of the same species living in an ecosystem form a:

The living component of an ecosystem forms the:

The place where there is a set of conditions that a species is adapted to live in is the:

Organisms that produce organic compounds from inorganic substances and the energy from the Sun are called:

Herbivores are also called:

Organisms that feed on the remains of other living things are called:

The linear sequence that shows graphically how matter and energy are transfered from one trophic level to the next, with arrows pointing the animal that eats the other one, is the:

Only about this amount of the energy from one level is transfered up to the next level in a food pyramid:

The combination of many food chains is a:

Two birds that build a nest to raise together the babies have a relationship called:

Individuals that join together and create a solid structure have a relationship called:

Individuals who share the work within a colony have a relationship called:

A group of gazelles that join together to migrate have a relationship called:

A cheetah hunthing a gazelle have a relationship called:

A remora that swims beneath shark have a relationship called:

One individual that lives directly in or on the other, or within its home, have a relationship called:

A relationship in which both of the species involved benefit is called:

A relationship in which, if separated, the two organisms cannot survive, is called:

Lichens are formed by an algae and a fungi, that have a relationship called:

A plover that feeds on food particles stuck between the teeth of the cocodrile helping them keeping their teeth clean, have a relationship called: