What lacks a vertebral column, or backbone?
Options:
- (A) fungi
- (B) parasites
- (C) cacti
- (D) Leptospirosis
- (E) insects
- (F) bushes
- (G) Conifers
- (H) anostrans
--
Let's think first: Invertebrates are animals that lack a vertebral column, or backbone. Principal invertebrates are anostracans and ostracods. Anostrans lack a vertebral column, or backbone.... So the answer is [(H)]

What increases the stability of ecosystems?
Options:
- (A) overpopulation
- (B) water consumption
- (C) loose soil
- (D) Quality of life
- (E) agriculture
- (F) deforestation
- (G) ecotourism
- (H) trees
--
Let's think first: Biodiversity increases the productivity and stability of ecosystems. Ecotourism, on the other hand, can help to conserve biodiversity. Ecotourism increases the stability of ecosystems.... So the answer is [(G)]

What is the result of a dolphin keeping a high metabolism rate?
Options:
- (A) generate blood cells
- (B) generate heat
- (C) overheating
- (D) develop cancer
- (E) kinetic energy
- (F) aerobic capacity
- (G) exercise
- (H) Energy.
--
Let's think first: Mammals generate heat mainly by keeping their metabolic rate high. All dolphins are mammals and all mammals breathe air. Dolphins generate heat by keeping their metabolic rate high.... So the answer is [(B)]

What burrows help aerate soil, which is also good for plants?
Options:
- (A) leaves
- (B) adding heat
- (C) Exfoliation
- (D) good
- (E) roots
- (F) wind
- (G) rocks
- (H) annelids
--
Let's think first: Earthworm burrows help aerate soil, which is also good for plants. Earthworms Earthworms are in the phylum Annelids. Annelid burrows help aerate soil, which is also good for plants.... So the answer is [(H)]

Where does the energy to evaporate perspiration come from?
Options:
- (A) heat produced
- (B) The Sun
- (C) goosebumps
- (D) electrical energy
- (E) kinetic force
- (F) body heat
- (G) heat energy
- (H) energy
--
Let's think first: Evaporation of sweat uses energy, and the energy comes from body heat. Sweat glands pump perspiration through pores. Perspiration comes through pores and is evaporated by energy from body heat.... So the answer is [(F)]

What brings the building blocks of proteins to the ribosomes in the correct sequence?
Options:
- (A) recycling
- (B) flow of electrons
- (C) Chemical energy
- (D) it needs them
- (E) an engine
- (F) light energy
- (G) A computer
- (H) molecules of tRNA
--
Let's think first: Molecules of tRNA bring amino acids to the ribosome in the correct sequence. Amino Acids Amino acids are the building blocks of proteins. Molecules of tRNA bring the building blocks of proteins to the ribosome in the correct sequence.... So the answer is [(H)]