Which of the following statements is the most likely explanation for the decrease in sea urchin abundance seen between 1980 and 1990?
Choose 1
Choose 1

(Choice A)
A
The sea urchin population was reduced by a density-dependent factor that had a positive effect on embryo development.

(Choice B)
B
The sea urchin population was reduced by a density-independent factor that had a negative effect on embryo development.

(Choice C)
C
The sea urchin population was reduced by a density-independent factor that directly caused the environment’s carrying capacity for sea urchin embryos to decrease.

(Choice D)
D
The sea urchin population was reduced by a density-dependent factor that directly caused the environment’s carrying capacity for sea urchin embryos to increase.

enzyme speed up the reactions

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.