(Question)
Echinoderms lack a centralized nervous system, and another group of echinoderms are the echinoids. Given these facts, what do echinoids lack among the following options: - characteristics  - centralized nervous system  - permineralization  - the body's largest organ  - biological diversity  - that material's properties  - aerobic capacity  - organic matter
(Answer)
centralized nervous system


(Question)
Cell division is more complex in eukaryotes than prokaryotes, and prokaryotes are smaller and simpler than eukaryotes. Given these facts, what is less complex in smaller, simple cells among the following options: - sensory neurons  - Cell death  - peachleaf willow  - Cell division  - Sex  - permineralization  - Veins and arteries.  - Pregnancy
(Answer)
Cell division


(Question)
Many consumers feed at more than one trophic level, and cows and sheep are examples of primary consumers. Given these facts, what can feed at more than one trophic level among the following options: - sheep  - salmon  - grasses  - bats  - animals  - shrubs  - humans  - trees
(Answer)
