Complete the sentences. Use words from the list. Each word may be used once, more than once, or not at all. arthropods, carnivore, consumer, endoskeleton, exoskeleton, five, four, habitat, herbivore, population, producer, three, vertebrates Crustaceans belong to the same group as insects, known as [BLANK]. Every crustacean has at least [BLANK] pairs of legs. They also possess a hard outer body covering called an [BLANK]. Seven individuals of one species, Cancer pagurus, were discovered in the same pool. These individuals form a [BLANK]. Cancer pagurus is a [BLANK] because it feeds on fish and other animals. Seaweed makes its own food, so it is a [BLANK].
State what information would be required to work out its actual size, and explain the method you would use.
Suggest two reasons for their presence there.
Describe the way their scientific names show that they are closely related.
Although they are closely related, they are unable to interbreed successfully. Describe the way their scientific names show that they cannot successfully interbreed.