Mixed Questions- Please Help! Am I on the right track?

Question

1- Assuming we have a Hardy-Weinberg equilibrium population & the frequency of the dominant allele "B" is 90% & that "b", the recessive allele is the only other allele at this gene locus in the population, what would be the expected frequency of Heterozygous individuals in this population?

2-Why would a female animal prefer to mate w/ a male who is both physically attractive & a good father?

3- 1 Function of the water vascular system?

4- 2 General Structural features that Annelids & Arthropods Share?
---
1- ?? I don't really understand what I'm supposed to do, do I make a punnet sqaure? I don't know where to begin or how to answer this.

2- Physically attractive= So that the offspring will have good alleles & so when the time comes, it won't have so much trouble finding a mate?
Good father= to proveide protection, & give female comfort & relief? Does that explain WHY though?

3- Locomotion?

4- ?

Please Help Me. I would really appreciate it! Thank You so Much! = )

1- Is this correct?
p +q= 1

0.9 +0.1= 1.00

B= 90%
b=10%
Idk what I'm doing... but if this is correct would my final answer be a percentage to express frequency?

Answer 1

1. frequency of heterozygotes = 2pq = 0.18

2. Good answer

3. Transport water from ground to leaves.

4. Segmented bodies, no internal skeleton,