Explanation:
Do a partial water change. ...
Scoop out any organic matter that shouldn't be there. ...
Reduce the frequency and quantity of food given. ...
Introduce healthy bacteria to the water. ...
Lower your tank's pH. ...
Try increasing aeration of the water. ...
Use neutralizing drops.
This is the correct answer
Answer:
sedimentary rocks
Explanation:
can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years. So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil.
Increase of earth's average temperature
Answer:
Poriferans.
Explanation:
The evolution of the organisms has been occur from the simple organisms and leads to the evolution of the more complex organisms. This complexity arises due to the changing environment of the organisms.
The protozoans are the simplest organisms and all the other animal lineage has been derived from the porifera. The porifera are the cellular organisms that do not have tissue level of organization and simple physiological system. Later, diverse and complex organisms arise from the porifera.
Thus, the correct answer is option (1).