Why are there seasons

A. earth revolves around the sun

B. earth rotates on its axis

C. earths axis titled

D. the moon revolves around earth

The endosperm of a Conifer seed is: a) Haploid (n). b) Diploid (2n). c) Triploid (3n). d) Tetraploid (4n).

The countercurrent arrangement of the two limbs of the loop of henle becomes a multiplier of electrolyte concentration due to which other characteristic?

Which of the following is NOT a true statement about ATP? A. consists of ribose, adenine, and three phosphate groups. B. ADP is produced when ATP releases energy. C. ATP provides energy for the mechanical functions of cells. D.

Is the vaccine effective?

Which food provides the body with energy in the form of carbohydrates? A. whole grains B. fish C. vegetables D. lean meats

What converts energy from sunlight to chemical energy in a cell?

What is the difference between elements compounds and mixtures

ALSUM genes d. sex chromosomes 47. Down syndrome is characterized by having an extra copy of at least a portion of chromosome 21. Which of following methods would quickly identify the disorder? a. Pedigree chart c. meiosis map b. Karyotype d.

For what percentage of time has life existed on earth round to the nearest whole number

What does this similarity at the molecular level in yeast and humans most likely indicate