Under a microscope, you can see that a plant cell has only half the usual number of chromosomes. What stage of the plant's life-cycle are you witnessing?

Which of the following does not represent a property of water? a. a frozen lake b. a mosquito standing on water's surface c. a glass of sweetened tea d. all of the above e. none of the above

Which planet is the only one known to have oceans of liquid water? Mercury Venus, Earth, Mars

Milena says that it is possible to get wrinkled seeds even if both parent plants have smooth seeds. is she correct? explain your answer by drawing a punnett square in the space below. yes/no

This is the transport of material out of a cell by means of a sac or vesicle that first engulfs the material and then is extruded through an opening in the cell membrane.

Controls hormone levels by shutting down hormone production when levels are correct endocrine system endocrine glands negative feedback

Which is a type of muscle that powers the cardiovascular system? A. Skeletal muscle B. Cardiac muscle C. Cartilage muscle D. Smooth muscle

To investigate how the sex of an offspring is determined

Tightly curled hair is caused by a dominant autosomal gene in humans. This trait is rare among northern Europeans.

The rapid depolarization phase of the action potentials of myocardial contractile cells is due primarily to which ion (s) ?

Echinoderm reproduction typically is a. sexual reproduction by budding. b. sexual reproduction with internal fertilization. c. by regeneraton. d. sexual reproduction with external fertilization.