[Q] What lacks walls and membranes?
Options:
- (A) deserts
- (B) flower cells
- (C) viruses
- (D) fungi
- (E) tree cells
- (F) bacteria
- (G) plant cells
- (H) alpacas
[A] Here's my solution: Viruses are not cells. Plant cells are surrounded by a cell membrane and a cell wall. Viruses do not have walls and membranes. The answer is (C).

[Q] What is the process of removing feces and excess water from the human body called?
Options:
- (A) recycling
- (B) salivation
- (C) waste production
- (D) excretion
- (E) Exfoliation
- (F) perspiration
- (G) Deposition.
- (H) Deposition
[A] Here's my solution: Excretion is the process of removing wastes and excess water from the body. Solid waste is called feces. Excretion is the process of removing feces and excess water from the body. The answer is (D).

[Q] What do plants respond to?
Options:
- (A) Chemical energy
- (B) Vibrations
- (C) heat energy
- (D) Sulfur dioxide
- (E) Temperature
- (F) sun's heat
- (G) Clouds
- (H) Wood
[A] Here's my solution: Plants respond to daily and seasonal cycles and to disease. Temperature follows a seasonal cycle. Plants respond to temperature. The answer is (E).

[Q] Trna and the ribosome work to produce:
Options:
- (A) A kernel
- (B) protein
- (C) food
- (D) Energy.
- (E) power
- (F) Joules
- (G) alleles
- (H) Energy
[A]
Here's my solution: Molecules of tRNA bring amino acids to the ribosome in the correct sequence. Ribosome binding site, start and stop codons, protein coding sequence. Molecules of tRNA bring amino acids to the ribosome to create proteins. The answer is (B).