Which scientist formed his ideas about living things by performing observations with out using a microscope? A. Hooke B. malpighi C. van leeuwenhoek D. vesalius

A fruit fly has four chromosomes. The zygote formed by the sperm and the egg of fruit flies will have chromosomes.

What kind of research is most likely to improve the health of the environment

What kind of fertilization and development does the red kangaroo exhibit

What is the fluid in the blood that contains water, nutrients, protines, salts and hormones?

Which explains how the advantage of genetic variation through sexual reproduction occurs? One of each pair of chromosomes comes from each parent. The union of sperm and egg occurs during meiosis. Meiosis occurs in all body cells also.

A river has a large amount of algae growing. Which most likely caused the growth?

Which of the following statements is true? Natural energy sources are nonrenewable and being depleted. Current fuels are not polluting the air. Mercury released into aquatic ecosystems comes from rock erosion.

Which causes a decrease in the amount of dissolved oxygen in a lake? A. lower temperatures B. fertilizer runoff C. overfishing

If you were to breed a black male guinea pig to a brown female guinea pig in an attempt to determine which one was homozygous dominant and which one was homozygous recessive, how could you be certain that the guinea pigs are truly homozygous?

How many chemical bonds can each carbon atom form?