Ut the following animal adaptations in order from earliest to most recent adaptation. A. backbone→no symmetry→radial symmetry→bilateral symmetry B. no symmetry→radial symmetry→bilateral symmetry→backbone C. no symmetry→radial symmetry→backbone→bilateral symmetry D. no symmetry→bilateral symmetry→radial symmetry→backbone E. no symmetry→backbone→radial symmetry→bilateral symmetry

B no symmetry→radial symmetry→bilateral symmetry→backbone

Explanation:

In the evolution of body symmetry, radially symmetrical animals evolved from animals that completely lack body symmetry while bilaterally symmetrical animals evolved from radially symmetrical ones as they keep adapting to their changing environments.

In addition, only bilaterally symmetrical animals have backbones.

Hence, the direction of adaptation from earliest to most recent would be from asymmetry to radial symmetry to bilateral symmetry to backbone.

The correct option is B.

a chair, a bed, and a toothbrush

explanation:

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.