The most successful animals on Earth

Question 1

Maya is writing a short paragraph about the animal group that has the highest number of described species. Which sentence below states this fact correctly?

Accepted Answer

Scientists have officially identified about one million insect species, more than any other group of animals.

Answer

Scientists have officially identified about one thousand insect species, which is more than any other group of animals.

Answer

Scientists have officially identified about one million bird species, which is the largest number among animal groups.

Answer

Scientists have officially identified about ten thousand mammal species, which is the highest count of any animal group.

Question 2

Sam is writing a short report about why beetles are found in almost every habitat on Earth. Which two reasons best explain their great success?

Accepted Answer

They are very small and reproduce quickly.

Answer

They are warm‑blooded and need a lot of food.

Answer

They grow very large and live for many years.

Answer

They can breathe fire and change colour instantly.

Question 3

A biologist tells you that the animal group with the highest number of described species has about one million species. Which of the following statements correctly identifies that group and the approximate number of known species?

Accepted Answer

Insects – about 1,000,000 known species, making them the most species‑rich animal group.

Answer

Birds – about 1,000,000 known species, making them the most species‑rich animal group.

Answer

Insects – about 10,000 known species, making them the most species‑rich animal group.

Answer

Mammals – about 1,000,000 known species, but they are not the most species‑rich group.

Try three questions

Maya is writing a short paragraph about the animal group that has the highest number of described species. Which sentence below states this fact correctly?

Sam is writing a short report about why beetles are found in almost every habitat on Earth. Which two reasons best explain their great success?

A biologist tells you that the animal group with the highest number of described species has about one million species. Which of the following statements correctly identifies that group and the approximate number of known species?

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