1. The first living organism in a food chain is a) producers
b) primary consumers
c) heterotroph
d) chemosynthesizer

2. The second living organism in a food chain is generally...
a) herbivore
b) carnivore
c) detrivore
d) a photoautotroph

3. Plants use nitrogen to grow and are generally helped by cycling N from the air to the land by bacteria in a process called...
a) nitrogen fixation
b) denitrification
c) decomposition
d) emmigration

1-a 2-a 3-a

1. The first living organism in a food chain is

a) producers

b) primary consumers

c) heterotroph

d) chemosynthesizer

2. The second living organism in a food chain is generally...

a) herbivore

b) carnivore

c) detrivore

d) a photoautotroph

3. Plants use nitrogen to grow and are generally helped by cycling N from the air to the land by bacteria in a process called...

a) nitrogen fixation

b) denitrification

c) decomposition

d) emmigration

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands