A woman gives birth to a son. Two years later, she gives birth to another son. What is the probability that her third child will be a girl? Explain your reasoning.

What does nitrogen do to soil

The skeleton that donald johanson discovered and named lucy bleonged to the ealest homind group called? a. neanderthals b. homo habilis c. australopithecines d. homo erectus

Deep water rises along the coast of Peru to replace surface water carried away from the coast by strong winds. Why is upwelling important?

Two lab partners are doing a static electricity investigation. They begin with a positively-charged pop can. After conducting the procedure, they observe that the pop can has become electrically neutral.

ATP is a form of energy for the cell. ATP is synthesized in a process called cellular respiration. This process takes place in which organelle? A. golgi apparatus B. nucleus C. ribosomes D. mitochondria

Alpine Marmots are a type of rodent that have the ability to decrease their body activity to conserve food. These marmots most likely hibernate during the cold winter months. build fires on cold winter nights.

Do fly's eat anything?

Examples of temporary change

One pair of alleles controls eye color in fruit flies. More than ten different eye colors are possible, ranging from bright red to apricot to tan to white. What kind of inheritance is this? How do you know?

Assume that in squashes the difference in fruit weight between a 3-lb type and a 6-lb type results from three independently segregating allele pairs, A/a, B/b, and C/c. Each capital-letter allele contributes a half-pound to the weight of the squash.