The classifications system changed from seven to get. This happened because

Farmers use a variety of approaches in an effort to produce more successful yields. These may include hormones, antibiotics, herbicides, pesticides, and forms of biotechnology like plant breeding or genetic engineering.

During the 20th century, which method of studying the brain led to a burst of knowledge about the nervous system?

A distention of the renal pelvis due to urine collecting in the kidney is

The vinegar was used to remove the shell from the raw egg. What other effects did the vinegar have on the egg?

Which of the following statements is true? The number of chromosomes in all organisms is the same. There are more chromosomes in a cell than there are genes. Sometimes, a single gene can influence many traits.

When a bird eats a small insect it can be considered a secondary consumer but what is the bird considered as when it eats seeds?

Desert animals, such as the kangaroo rat, need to conserve water. These animals have larger kidneys than do animals that live in moist environments and thus need not conserve water.

What is the function of a nucleus in a cell the nucleus A. controlls the cells activity B. the nucleus identifies the cell as belonging to a plant C. the nucleus determines what substances enter and leave the cell D.

Which best describes emerging scientific ideas? a. never been tested b. unpublished c. supported by most, but not all, scientists d. not studied by many scientists

A sonic boom is produced by a jet. What can you determine about the jet's motion? a) It is near a mountain where echos can be produced b) Its engines produced backfire c) It is increasing in altitude d) It is traveling faster than the speed of