Q: What are the main organs for breathing in a mammal? Choices: - gills - nostrils - intestines - lungs A:
lungs

(Question)
Q: Why does neptune's appearance change? Choices: - the seasons - the changing orbit - the speed of rotation - turbulent atmosphere A:
(Answer)
turbulent atmosphere

Ques: Q: What is the most common type of joint in the human body? Choices: - dorsal joints - transverse joints - proximal joints - movable joints A:
Ans: movable joints

(Q).
Q: How many types of surface waves are there? Choices: - over a hundred - three - six - two A:
(A).
two

Ques:Q: How many pairs of chromosomes are found in human cells? Choices: - 25 - 24 - 13 - 23 A:

Ans:23

Q: Approximately how many galaxies are there in the universe? Choices: - an infinite number - a trillion - an octillion - about a hundred billion A:
about a hundred billion