PLEASE HELP ME! Which of the following explains why tides occur every 12 hours and 25 minutes?
1. Variations in the land and depth of water make the tides uneven.
2. It takes 24 hours and 50 minutes for the earth to make a complete rotation.
3. Early scientists misunderstood how to calculate tides, and their error persists to this day.
4. In some seasons, the rotation of the earth is slower than others, requiring additional time.

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one