2 Points
A mangrove community has the following food chain:
Green algae - fish — mangrove tree crab - mangrove water snake-
American crocodile
Which population would be most likely to decrease if the mangrove water
snake population in this community increased in size?
O
A. Fish

American crocodile population will decrease.

Explanation:

In the food chain mangrove water snake is being consumed by American crocodile. The increase in the size of mangrove water snake would make it difficult for American crocodile to attack its prey.

The large size of the tertiary consumer would compete with the quaternary consumer in the food chain.

The quaternary consumer will find difficulty in having food and ultimately die thus decreasing the number of American crocodiles.

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.