Logic of a solution: *Plasma cells are activated B cells that secrete antibodies. Antibodies are manufactured by the immune system. Plasma cells are activated B cells that secrete immune system molecules.*
*(A)*
The original question: *The molecules secreted by activated b cells are part of the:
Options:
- (A) immune system
- (B) Organic compounds
- (C) Energy.
- (D) an organism's body
- (E) acetic acid
- (F) harmful substances
- (G) Chemical energy
- (H) Veins and arteries.*
Line 1: *Roundworms make up the phylum Nematoda. Also, nematoda and rotifera are important groups contributing to soils. Roundworms contribute to soils.*
*(D)*
Line 2: *_ contribute to soils.
Options:
- (A) Sediment
- (B) Aphids
- (C) cacti
- (D) Roundworms
- (E) Exfoliation
- (F) Amphibians
- (G) Ringworms
- (H) rainfall*
Logic of a solution: *Alternation of generations allows for both asexual and sexual reproduction. Advantages and disadvantages of sexual as opposed to asexual means of reproduction. Alternation of generations allows for using the most advantageous type of reproduction.*
*(B)*
The original question: *The most advantageous type of reproduction can be chosen when generational what is used?
Options:
- (A) Plants growth
- (B) alternation
- (C) competition
- (D) Chemical energy
- (E) A computer
- (F) colors
- (G) Energy.
- (H) Energy*
Line 1: *Some mollusks are nearly microscopic. Interestingly, a squid is also a mollusk. Some squids are nearly microscopic.*
*(A)*
Line 2: *What sea creature can sometimes be microscopic?
Options:
- (A) squids
- (B) a fish
- (C) fungi
- (D) tortoises
- (E) fossils
- (F) barnacles
- (G) bacteria
- (H) alpacas*
Logic of a solution: *Most invertebrates have a nervous system. Jellyfish and insects are invertebrates. Jellyfish have a nervous system.*
*(B)*
The original question: *What has a nervous system?
Options:
- (A) Nerve tonic
- (B) Jellyfish
- (C) Air
- (D) fur seals
- (E) Cardiovascular system
- (F) animals
- (G) chickens
- (H) elephants*
Logic of a solution: *Many corals secrete an exoskeleton that builds up to become a coral reef. An atoll is the third type of reef. Atolls are built by corals secreting an exoskeleton.*
*(B)*
The original question:
*How are atolls built?
Options:
- (A) important habitats
- (B) By coral exoskeletons
- (C) by fish
- (D) with machines
- (E) by a type of eel
- (F) It used to be covered by water
- (G) The area was once underwater
- (H) reusing materials*