Which season is occurring in the southern hemisphere when earths northern hemisphere is tilted toward the sun?

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Are the earth's ocean floor and continents the same age geologically? why or why not?