The table shows the times of sunrise and sunset and the total amount of insolation received on Earth’s surface at four locations, A, B, C, and D, at the beginning of each season. The locations have the same longitude, but are at different latitudes. Data were collected on clear, sunny days. Why are the times of sunrise and sunset for March 21 and September 23 nearly the same at each location?
1. The Sun’s altitude at noon is the same everywhere on Earth on these days.
2. Earth is at its closest and farthest points from the Sun on these days.
3. The Sun’s insolation reaches its maximum intensity on these days.
4. The Sun is directly above the Equator on these days.

Two male mice, which we will call male a and male b, are both phenotypically normal. male a was from a litter that contained half phenotypically normal mice and half dwarf mice. the mother of male a was known to be homozygous for the normal igf2 allele. male b was from a litter of eight mice that were all phenotypically normal. the parents of male b were a phenotypically normal male and a dwarf female. male a and male b were put into a cage with two female mice that we will call female a and female b. female a is a dwarf and female b is phenotypically normal. the parents of these two females were unknown, although it was known that they were from the same litter. the mice were allowed to mate with each other, and the following data were obtained: female a gave birth to three dwarf babies and four normal babies. female b gave birth to four normal babies and two dwarf babies. which male(s)mated with female a and female b? male a with both females male a with female b, and male b with female a male a with female a, and male b with female b could not be determined male b with both females

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !