Explain why a circulatory system is important in meeting the needs of all cells throughout an animals body

Certain mutations in the regulator gene of the lac system in E. coli result in maximal synthesis of the lac proteins (β-galactosidase, etc.) even in the absence of the inducer (lactose). Provide an explanation for this observation.

A rock collection comes from which part of Earth? atmosphere biosphere geosphere hydrosphere

This cycle uses super-heated water from underground to give us power geothermal solar nitrogen oxygen

A red flower with a heterozygous genotype for petal color would have a genotype of: A. RR B. rr C. WW D. Rr

The life expectancy at birth in sierra leone is about 38 years. what can you infer about the population of sierra leone?

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