q: What is true of all adult sponges?
Options:
- (A) they are immobile.
- (B) at or near the margins
- (C) They may not survive.
- (D) water conservation
- (E) Light passing through water
- (F) competition
- (G) To keep their body heat.
- (H) permineralization
a: (A)... Explanation: Adult sponges are sessile. Sessile Attached permanently, immobile. Adult sponges are attached permanently, immobile. That's why the answer is (A).

q: The penetration of the egg by a sperm takes place where?
Options:
- (A) salt and water.
- (B) an area swollen with pus
- (C) By wind and rain
- (D) outside the body
- (E) Earth revolving around the sun
- (F) inside the prostate
- (G) inside the female organism
- (H) inside the male organism
a: (G)... Explanation: Fertilization takes place inside the female organism. Fertilization is the penetration of the egg by a sperm. The penetration of the egg by a sperm takes place inside the female organism. That's why the answer is (G).

q: Brain tumors occur when what is no longer regulated?
Options:
- (A) fossil fuels
- (B) headaches
- (C) voltage
- (D) heat or cold
- (E) cell cycles
- (F) critical organs
- (G) cerebellum
- (H) migraines
a: (E)... Explanation: Cancer is a disease that occurs when the cell cycle is no longer regulated. Brain tumors are one of the fastest growing cancers today. Brain tumors occur when the cell cycle is no longer regulated. That's why the answer is (E).

q: What describes something that requires activation energy to get started?
Options:
- (A) igniting fuel and oxidiser
- (B) heating liquids
- (C) Fully cooking the oysters
- (D) Riding a bike
- (E) an engine
- (F) burning coal
- (G) chemical equations
- (H) Firecrackers
a:
(G)... Explanation: All chemical reactions require activation energy to get started. Chemical equations describe chemical reactions. Chemical equations describe something that requires activation energy to get started. That's why the answer is (G).