What lack respiratory and excretory systems?
Options:
- (A) They may not survive.
- (B) members of their own species
- (C) platypus
- (D) humans
- (E) crinoids and blastoids
- (F) passenger pigeons
- (G) graptolites
- (H) whales
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Let's think first: Echinoderms lack respiratory and excretory systems. Echinoderms in the diorama include the crinoids and blastoids. Crinoids and blastoids lack respiratory and excretory systems.... So the answer is [(E)]

The vascular cambria allows:
Options:
- (A) Exfoliation
- (B) roots to grow
- (C) plant
- (D) movement
- (E) Animal survival
- (F) soil
- (G) liver
- (H) rapid expansion
--
Let's think first: Roots grow in length and width from primary and secondary meristem. Vascular cambium is a primary meristem. Roots grow in length and width from the vascular cambium.... So the answer is [(B)]

Animals that tend to have complex nervous systems are missing what?
Options:
- (A) Energy
- (B) Energy.
- (C) nervous system
- (D) Chlorophyll
- (E) backbone
- (F) alleles
- (G) abdomen
- (H) brain
--
Let's think first: Most invertebrates have a more complex nervous system. Invertebrates are animals without a backbone. Most animals without a backbone have a more complex nervous system.... So the answer is [(E)]

What is the euphrates larger than?
Options:
- (A) ocean
- (B) planet
- (C) trees
- (D) sea
- (E) Inches
- (F) Sediment
- (G) stream
- (H) Length
--
Let's think first: Rivers are usually larger than streams. And the fourth river is the Great River, the river Euphrates. The Euphrates is larger than a stream.... So the answer is [(G)]

What causes the penis to develop?
Options:
- (A) Creatine
- (B) Energy
- (C) Estrogen
- (D) Testicles
- (E) matter vibrating
- (F) Testosterone
- (G) movement
- (H) It expands
--
Let's think first: Testosterone stimulates the reproductive organs to develop into male organs. Male mammals have a tube-like organ called the 'penis'. Testosterone causes the penis to develop.... So the answer is [(F)]

What can some insects use their feelers to detect?
Options:
- (A) kale
- (B) noise
- (C) water vapor
- (D) tremors
- (E) waves
- (F) vibrate
- (G) air
- (H) sound
--
Let's think first: Some insects can use their antennae to detect sound. An insect's head has two feelers, or antennae. Some insects can use their feelers to detect sound.... So the answer is [(H)]