What indicates to a muscle that it should contract

At body temperature, which of these combinations is most likely to result in the digestion of proteins?

Which of the following occurs when substances undergo chemical changes? Bonds between atoms are broken and new bonds are formed. Atoms change from one element into another element. Old atoms are destroyed and new atoms are created.

A student has earned steak which contains protein and fat How is the protein digested?

Does anyone have any science topic ideas?

Precipitation clouds are observed at a distance of about 700 miles to the west of a city. The clouds are seen moving eastwards at an average rate of 20 miles per hour. Which of these statements best predicts the weather in the city within 24 hours?

The climate with which the monsoon forest is best associated with is

What is the temp of the suns middle most layer

What's the difference between an endoskeleton and an exoskeleton

In pea plants, the gene for the color of the seed has two alleles. In the Punnett square shown below, the dominant allele (Y) represents yellow and the recessive allele (y) represents green.

Kidney dialysis relies on diffusion of various dissolved waste molecules (solutes) across a non-living semipermeable membrane.