What is the process by which organisms give rise to their young?
Options:
- (A) Summer
- (B) cell division
- (C) autumn
- (D) Plants growth
- (E) peachleaf willow
- (F) ejaculation
- (G) reproduction
- (H) mating rituals
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Let's think first: Reproduction is the process by which organisms give rise to offspring. Fetus is Latin for offspring or young one. Reproduction is the process by which organisms give rise to their young.... So the answer is [(G)]

What relaxes, thereby causing aneurysms?
Options:
- (A) layers of fat
- (B) Veins and arteries.
- (C) sweating
- (D) matter vibrating
- (E) blood vessels
- (F) the skin
- (G) Chemical energy
- (H) sensory neurons
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Let's think first: Dilation occurs when cell walls relax. An aneurysm is a dilation of a blood vessel. Aneurysms are caused by relaxation of cell walls of blood vessels.... So the answer is [(E)]

A platypus is an example of _.
Options:
- (A) Marsupial.
- (B) Monotremes.
- (C) insects
- (D) animals
- (E) killing insects
- (F) Amphibian.
- (G) Placental mammal.
- (H) matter vibrating
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Let's think first: Monotremes are mammals that reproduce by laying eggs. Well, platypuses are mammals, and they lay eggs. Platypuses are monotremes.... So the answer is [(B)]

What is the process by which living things give rise to offspring?
Options:
- (A) DNA
- (B) photosynthesis
- (C) bird
- (D) sex
- (E) subtraction
- (F) gametes
- (G) eggs
- (H) ovum
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Let's think first: Reproduction is the process by which living things give rise to offspring. Sex equals reproduction. Sex is the process by which living things give rise to offspring.... So the answer is [(D)]

Which of these trees seasonally sheds its leaves?
Options:
- (A) gone forever
- (B) Exfoliation
- (C) Most plants
- (D) Mulberry
- (E) ligt
- (F) vegetation
- (G) Heavy rains
- (H) homogenous
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Let's think first: Plants that shed their leaves seasonally each year are called deciduous plants. Mulberry trees are deciduous. Mulberry trees seasonally shed their leaves.... So the answer is [(D)]

How do male dogs mark their territory?
Options:
- (A) Chemical energy
- (B) Hot dog eating contest
- (C) Adequate signage
- (D) with their fur
- (E) Scent marker
- (F) heat produced
- (G) mate with females
- (H) Paint
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Let's think first: Male dogs use pheromones in urine to mark their territory. During Urination Dog's urine is used as a scent marker for other dogs. Male dogs mark their territory with a scent marker.... So the answer is [(E)]