Does sand have cells?

Draw a pie chart to illustrate the number of Baobab tree species found in Madagascar, Africa and Australia

How do bird skulls (when they are embryos) relate to dinosaurs

Which statement is true about the thyroid hormones? (1) They increase the rate of metabolism in cells throughout the body. (2) They control how quickly cells use energy. (3) They are not steroid hormones.

The Karez well system a. was the first known use of wells b. was a postindustrial system C. transported groundwater from a distance d. all of the above

An enzyme was isolated from digestive juices taken from the small intestine. an experiment was set up to test the ability of the enzyme to break down protein.

The mitochondrial DNA sequences of a large extended family were analyzed and compared to a single male in the family. Which of the relatives' mitochondrial DNA should be a match to this person?

How do you explain that the variability in a domesticated species is greater than in the same species, or a similar one, in the wild? For example: dogs vs. wolves; chickens vs. red jungle fowl.

Which of the following traits do archaeans and bacteria share? A) composition of the cell wall B) lack of a nuclear envelope C) presence of plasma membrane D) both A and B E) both B and C

In a population of birds, the percentage of individuals having a certain gene changes from 20% to 60% over the span of several hundred years.

How many codons equal an amino acid?