How long will it take three quarters of a sample of a radioactive

element to decay if its half-life is 4 days?

a. 2 days

b. 3 days

c. 4 days

d. 8 days

What are the contractile proteins?

The gas that makes up the majority of our atmosphere is

Scientists observed that over the past 40 years, marmots (types of squirrels) are located at increasing elevations on mountains. what is the best explanation for this observation?

What are the stencil cutouts placed inside lighting instruments?

Which best contrasts flocking and schooling? A) Flocking provides aerodynamic efficiency and schooling provides hydrodynamic efficiency. B) Flocking provides protection and schooling provides hydrodynamic efficiency.

Where is fresh water found? Select three options, rivers oceans ice sheets water vapor coastal wetlands

A mineral that breaks along one or more straight lines exhibits which property ФωФ

Which of the following is a biotic factor? a. Parasites b. Sun c. Soil d. Temperature

When nucleotide sequence of the cell's DNA becomes altered it causes what

Factors that can alter the level of expression of a gene include Check All That Apply an increase in l temperature. an increase in salinity. exposure to UV radiation. presence of particular energy substrate.