Line 1: *Sex hormones are chemical messengers that control sexual development and reproduction. Chemical messengers carry signals from one nerve branch to another. Sex hormones carry signals that control sexual development and reproduction.*
*(A)*
Line 2: * _carry signals that control sexual development and reproduction
Options:
- (A) sex hormones
- (B) electricity
- (C) nucleic acid
- (D) Most plants
- (E) animals
- (F) genes
- (G) dendrites
- (H) photons*
Logic of a solution: *Most invertebrates have a nervous system. Insects are the most common invertebrates. Insects have a nervous system.*
*(H)*
The original question: *What has a nervous system?
Options:
- (A) animals
- (B) tortoises
- (C) crocodiles
- (D) sponges
- (E) elephants
- (F) placozoans
- (G) mesozoans
- (H) insects*
Line 1: *Carbon monoxide is a gas produced by furnaces and other devices that burn fuel. Fuel is burned inside the engine. Carbon monoxide is a gas produced by furnaces and other engines.*
*(E)*
Line 2: *Carbon monoxide, a product of furnaces and engines, is a:
Options:
- (A) acid
- (B) CO2
- (C) kill
- (D) harm
- (E) gas
- (F) form
- (G) CO 2
- (H) HPV*
Logic of a solution: *Birds are endothermic tetrapod vertebrates. Some birds fly and some birds swim, but all birds have feathers. Some aviary species fly and others swim but, all are endothermic tetrapod vertebrates.*
*(F)*
The original question: *Some aviary species fly and others swim but, all endothermic tetrapod vertebrates share what trait?
Options:
- (A) warm-blooded
- (B) Weight
- (C) fur and fat
- (D) sweating
- (E) Epidermis
- (F) feathers
- (G) retina
- (H) four limbs*
Line 1: *Producers make food from inorganic molecules. Plants are known as producers . Plants make food from inorganic molecules.*
*(B)*
Line 2: *Plants make food from what?
Options:
- (A) Chemical energy
- (B) inorganic molecules
- (C) photosynthesis
- (D) Light passing through water
- (E) direct energy
- (F) absorb light energy
- (G) Organic compounds
- (H) In their leaves*
Line 1: *Some viruses can cause cancer. Lung cancer is a formation of tumors in the lung. Some viruses result in the formation of malignant tumors.*
*(C)*
Line 2:
*Which is the most likely cause of throat tumors?
Options:
- (A) cigars
- (B) Allergies
- (C) viruses
- (D) Pesticides
- (E) rocks
- (F) doctors
- (G) the skin
- (H) water*