What common condition is caused by the presence of three copies of chromosome 21?

A heterozygous tall pea plant is crossed with a short plant. The probability that an F1 plant will be tall is

Write an explanation based on natural selection for the high incidence of tusklessness among female elephants in Gorongosa.

Describe the two different ways to measure the size of an earthquake

meter stick would be the most appropriate tool to use in which of the following investigations? A. Mikah wants to measure the volume of water in a beaker. B. Danielle wants to measure the distance between two large cities. C.

A middle age star that burns hydrogen is a A. Main sequence star B. Neutron star C. White dwarf D. Pulsar

Where do you think this heat lamp is being used?

Battery disposal is a disadvantage of which form of energy?

If a cell has 4 pairs of chromosomes, after mitosis each daughter cell will have how many chromosomes?

Which two families of flowering plants provide protein for the majority of humans?

A. what are the primary abiotic factors that will affect life underwater? b. Explain how the abiotic factors such as depth, Temperature, and some other mentioned in the questions before affect aquatic organisms.