I believe the answer is oxygen only
The correct answer is: 4) Standing defenses are always present; induced defenses develop in response to a threat
Induced defense is defense that can be changed or invoked when needed. Induced defenses are slow to happen. When invoked, induced defense requires energy but otherwise doesn’t.
Standing defense is always there. It is use, for example when predation is a constant threat.
It is symbiosis, but also called a commensalism relationship because the remora is getting its food and the shark has no benefit.
Answer:
B(sperm production)
D(appearance of secondary sex characteristics)
Explanation:
