The problem starts already earlier:wildlife experts can only estimate the number of species in the world generally!
This is the case because there are simply too many species, and it takes time to documents them; because some areas (ocean bottom for example) are very hard to access and because sometimes it's hard to know whether we're talking about a new species or a variation within the same species.
so if we even don't know how many species there are, it's even harder to know how many are endangered.
Answer:
D. threat; challenge
Explanation:
Anything that causes an organisms stress process to initiate is called a stressor.
Threat is something that can cause us harm or something which we perceive might cause us harm.
A challenge is a threat, if overcome can cause us to grow our personality.
So, a threat is something which we cannot overcome while a challenge is a threat which we perceive can overcome and will be beneficial for us.
Answer: Teaching given by Marta is about the language usage so that control over intense feeling can be achieved
Explanation: As Marta's son got tired from the zoo trip and also got slight injury on the knee , she is trying to calm him with the talk as he is angry and upset. The intense feeling of anger and distress is required to be calmed doen so Marta is taking about the good events of the zoo.
Language in the form of taking is playing the role as the controlling medium. By talking about fun and tiring day she is trying to teach Roberto about the controlling the intense feeling through the medium of language.
