Which of these best describes the cause of waves in the ocean?
high and low tides
evaporation of water
wind blowing across the surface of the ocean
ridges and trenches on the bottom of the ocean
which one

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

In a population that is in hardy-weinberg equilibrium, there are two possible alleles for a certain gene, a and a. if the frequency of allele a is 0.4, what fraction of the population is heterozygous? a. 0.40 b. 0.60 c. 0.16 d. 0.48

Identify the structures ! 20 points