WorksheetsAnimal Evolution and Complexity Quiz
Total questions: 1
Worksheet time: 5mins
What is the main reason why animals are considered simple or complex?
Their ability to perform specialized functions
Their tissue complexity
Their ability to reproduce asexually
Their size and shape
Which phylum of animals is considered the simplest due to their lack of specialized tissues or organs?
Porifera
Cnidaria
Nematoda
Platyhelminthes
What is the significance of the Cambrian Explosion in animal evolution?
It resulted in the formation of the first human ancestors
It marked a period of rapid innovation and diversification of animal phyla
It led to the appearance of the first animals on Earth
It caused a mass extinction event
Which phylum of animals is characterized by having an incomplete body cavity known as a pseudocoelom?
Rotifera
Nematoda
Cephalopods
Mollusca
What sets cephalopods apart from other molluscs?
They have half a billion neurons and are highly intelligent
They have a powerful muscle for shooting out water
They have a single, spiraled shell
They have a radula for scraping food
