1
What is multicellular and eukaryotic?
Animal
Scientists have described and named more than 1.5 million _________ of animals.
species
A(n) _________ is an animal with a backbone.
A(n) _________ is an animal that does not have a backbone.
vertebrate
invertebrate
An animal with ____________ can be divided into two parts that are nearly mirror images of each other.
bilateral symmetry
An animal with___________ can be divided into two parts that are nearly mirror images of each other anywhere through the central axis.
radial symmetry
A(n) _________ is an animal that has a notochord, a nerve cord, a tail, and structures called pharyngeal pouches.
chordate
A(n) ________ is a netlike control system that sends signals to and from all parts of the body.
neve net
_________ is the movement of substances from an area of higher concentration to an area of lower concentration.
Diffusion
Waste products that are not used by the body are removed by __________.
excretion
The only animals that have endoskeletons and exoskeletons are ________ and __________.
tortoises
turtles
Animals that eat ______and _____ have sharp teeth that cut up food and wide, flat teeth that grind up food.
plants
meat
______ ________ involves taking in water with food, pushing the water out through a filtering structure, and then eating the organisms that remain.
Filter feeding
To communicate in the dark, some animals use ___________.
bioluminescence
Genetic material from the female is in a cell called a(n) ______.
egg
Genetic material from the male is in a cell called a(n) ______.
sperm
The product of fertilization is a new cell called a(n)________.
zygote
_________ are tiny holes on the surface of an organism where oxygen enters the body and carbon dioxide leaves the body.
Spiracles
The chemicals that some animals use to communicate are called_______.
pheromones
A system that transports blood and other fluids into open spaces that surround organs in the body is called a(n)_____________.
open circulatory system
A(n) ________ is how an animal changes as the result of a stimulus.
response
If innate behavior involves a number of steps in a certain order, it is a(n) ________.
instinct
A developmental process in which the form of an animal’s body changes as the animals grows from an egg to an adult is known as _________.
metamorphosis
A(n)______ is a group of animals of the same species that live and work together in an organized way.
society
____________ is where animals might set up and defend an area for feeding, mating, and raising young.
Territory
In hot areas, some animals decrease activity for a period of time called _________.
estivation