Explain the difference between submergent and emergent marine plants. Describe the greatest challenge for a plant to adapt to living in the sea, and how some plant species manage that challenge.

The is thours ise the most intelligent invertebrate.

A. cuttlefish

B. squid

C. octopus

D. whelk

Why are red algae important to coral reefs?

The man attempts to pull the four wheeler up the incline and onto the trailer. From the position shown, is it more effective to pull on the rope at A, or would it be better to pull on the rope at B ? Draw a free-body diagram for each case, and do an equilibrium analysis to explain your answer. Use appropriate numerical values to do your calculations..

The man attempts to pull the four wheeler up the incline and onto the trailer. From the position shown, is it more effective to pull on the rope at A, or would it be better to pull on the rope at B ? Draw a free-body diagram for each case, and do an equilibrium analysis to explain your answer. Use appropriate numerical values to do your calculations.

Red algae can live deeper than other algae because they produce cellulose, which resists water pressure better.

A. true

B. false

For the numbers $116.0, 97.9, 114.2, 106.8$, and $108.3$, find the mean, standard deviation, and $90$% confidence interval for the mean.

Hydrocarbons in the cab of an automobile were measured during trips on the New Jersey Turnpike and trips through the Lincoln Tunnel connecting New York and New Jersey. ${ }^{11}$ The concentrations ( $\pm$ standard deviations) of $m$ - and p-xylene were

Turnpike: $\quad 31.4 \pm 30.0 \mu \mathrm{g} / \mathrm{m}^3 \quad$ (32 measurements)

Tunnel: $\quad 52.9 \pm 29.8 \mu \mathrm{g} / \mathrm{m}^3 \quad$ (32 measurements)

Do these results differ at the 95 % confidence level? At the 99 % confidence level?

The percentage of an additive in gasoline was measured six times with the following results: 0.13, 0.12, 0.16, 0.17, 0.20, 0.11%. Find the 90% and 99% confidence intervals for the percentage of the additive.

The military could train dolphins for warfare roles that include detecting and killing enemy frogmen or placing explosives on enemy ships. Argue the cases for and against such a practice.

What is the largest brown algae? Why is it important?

Which cephalopod is thought to be the most intelligent invertebrate?

What allows red algae to live deeper than other algae?

When you compare a ray's anatomy to a "typical" fish anatomy you find

A. no similarity at all

B. the same basic anatomy with adaptation to life on sandy bottoms.

C. That rays are not actually fish

D. none or the above