What body part would be attached to the external framework?
Options:
- (A) heart
- (B) insects
- (C) respiratory system
- (D) wings
- (E) humans
- (F) Tail
- (G) fat
- (H) digestive system
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Let's think first: Wings are part of the exoskeleton and attached to the thorax. An exoskeleton is an external framework. Wings are part of the external framework.... So the answer is [(D)]

Cells that divide uncontrollably may form _.
Options:
- (A) masses of eukaryotic origin.
- (B) masses of neoplastic origin
- (C) cause people to become sick.
- (D) Microscopic organisms
- (E) masses of prokaryotic origin.
- (F) masses of epithelial origin.
- (G) Veins and arteries.
- (H) Wither and die
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Let's think first: Cells that divide uncontrollably may form a tumor, or abnormal mass of cells. Tumor Tumors are masses of neoplastic origin. Cells that divide uncontrollably may form masses of neoplastic origin.... So the answer is [(B)]

What do organisms use carbon, oxygen, and hydrogen for?
Options:
- (A) agriculture
- (B) It helps them survive
- (C) to destroy energy
- (D) survival
- (E) to store energy
- (F) to waste energy
- (G) heat produced
- (H) to release energy
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Let's think first: Organisms use lipids to store energy. Lipids Lipids are also composed of carbon, oxygen and hydrogen. Organisms use carbon, oxygen, and hydrogen to store energy.... So the answer is [(E)]

What kind of animal doesn't have a centralized nervous system?
Options:
- (A) dog
- (B) mammals
- (C) cows
- (D) bird
- (E) human
- (F) elephants
- (G) starfish
- (H) a fish
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Let's think first: Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.... So the answer is [(G)]

Meiosis is the type of cell division that produces:
Options:
- (A) animals
- (B) Plant reproduction
- (C) Most plants
- (D) peachleaf willow
- (E) Plants growth
- (F) haploid cells
- (G) spread flower seeds
- (H) rapid expansion
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Let's think first: Meiosis is the type of cell division that produces gametes. Gametes are haploid egg or sperm that fuse to form a zygote. Meiosis is the type of cell division that produces haploid cells.... So the answer is [(F)]

Some invertebrates may have which feature?
Options:
- (A) invertebrate
- (B) fat
- (C) gills
- (D) exception
- (E) three
- (F) mollusk
- (G) complex
- (H) shell
--
Let's think first: Most mollusks have shells. Mollusks are invertebrates and are no exception. Some invertebrates have shells.... So the answer is [(H)]