Question

1.

Identify the adaptation(s) that were not used by plants to colonize land:

Select one:

a. muscles and cartilage attached to backbones

b. colorful flower petals, flavored nectar and pollen to attract insects

c. cell walls providing structural support for roots stems and leaves

d. cones, nuts and fruits for seed dispersion

2.

One of the most important consequences of the “oxygen revolution” for the emergence of multi-cellular life:

Select one:

a. formation of an ozone layer protecting against harmful UV radiation

b. formation of sediments to preserve fossils

c. mass extinctions of fish, trilobites and dinosaurs

d. inspired emerging eukaryotes to “fight the power”

3.

Kelp forests provide critical sources of food and habitat for a variety of marine invertebrates, zooplankton, bivalves and fish species. This makes kelp a ____________________species of their ecosystems. Sea otters, in turn, consume __________________ which feast on kelp. This makes sea otters a unique  ____________________ species, because they reduce the population of kelp consumers to a sustainable level, which prevents collapse of the entire ecosystem.

Select one:

a. cornerstone, sea urchins, keystone

b. sensitive, sea urchins, cornerstone

c. keystone, sharks, cornerstone

d. keystone, sharks, sensitive

Answer 1

Ans 1- a)

Ans 2- a)

Ans 3- a)