This lineage of Echinoderms is made up of sea lilies and feather stars, although the group was much
more diverse and abundant 500 million years ago. Adult feather stars can swim or crawl, while adult
sea lilies are sessile, with their central disk attached to a stalk.
a. Echinoidea
b. Ophiuroidea
c. Crinoidea
d. Holothuroidea
e. Asteroidea
C
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Many seeds are capable of surviving in a dormant or quiescent state for many years, or even centuries. Such seeds are not usually damaged by environmental extremes that would kill most other organisms
What main adaptation prevents the seeds from germinating before they are dispersed, and allows them to survive until environmental conditions are favorable for germination and seedling growth? A) A seed coat B) Two cotyledons C) A large quantity of stored nutrients D) Desiccation to 2-20 percent water E) Double fertilization
Describe the instinctive pattern typical of newly hatched cuckoos
What will be an ideal response?
Individual covalent bonds are stronger than individual ionic bonds
Indicate whether the statement is true or false
Which of the following traits are expected to be best communicated via costly signals?
a. the willingness for reciprocal grooming b. the ability to fight for a resource c. the ability to collect nesting material d. the level of infection with internal parasites