#1
- Ocean acidification is harmful for aquatic ecosystem
- This is being reason for death of many aquatic creatures
#2
CO_2 will form carbonic acid which is acidic in nature
- So it will decrease the pH
#3
PH stands for potential of Hydrogen .
- If pH is less than 7 it's acidic and if greater than 7 it's basic
Answer to 9 is b (because bodily fluid is the easiest way to contract a disease)
And answer to 10 is a (because the disease is transferred by saliva)
Answer:
keystone species
Explanation:
Keystone species are indispensable species that are essential to the maintaining of the balance of an ecosystem, and also play a major role in the way species in the ecosystem interrelate. The absence or removal of a keystone species from a habitat or ecosystem would lead to the disruption and imbalance of the ecosystem, and as such lead to the extinction of other species.
An example of a keystone species is the bee. Bees are very important in pollination of flowering plants and also ensure their survival. This plants serve as home to various insects that are source of food to birds. The removal of bees from this ecosystem would affect the ecological balance of this ecosystem.
