Which protein serves as a chemical messenger?

hemoglobin

actin

myosin

insulin

Why is the weight of an object more on earth then on the moon?

What is the correct order of the stages in an alcoholic's recovery?

Which of the following is something that probably would NOT be studied in a lab? A. what molecules are found in tea B. how birds migrate thousands of miles C. how hydrogen gas behaves as it is cooled D. what skin cells look like under a microscope

What system includes the lungs and airways?

Cells that are specialized A) are less complex. B) perform different functions for the organism. C) reproduce. D) are stem cells.

if research is restricted. then the new discoveries made are limited. which action is most likely to increase the number of discoveries scientist can make?

Which statement about nuclear fission is false? a: nuclear fission takes place in the core of the stars b: the fuel for nuclear fission is often uranium c: nuclear fission releases large amount of energy d: nuclear fission is used to generate

Some monkey flowers (Mimulus guttatus) living near the sites of copper mines can grow in soil containing high concentrations of copper, which is toxic to most plants. Copper tolerance is a heritable trait. Select the three statements that are true.

The lowest level of environmental complexity that includes both living and nonliving factors is the A: Biome B: Community C: Ecosystem D: Biosphere

Which part of the endocrine system is located in the middle of the brain