In a scientific experiment how many independent variables should be tested at the same time

What is he first system of the body that a common cold affects

A botanist scrapes pollen off a flower of one plant and then uses it to pollinate the flower of another plant. What can be scientifically concluded about their offspring

The vector used to transmit a gene segment is a

Which body systems primary function is the continuation of the species

Explain why all organisms in the food web are directly or indirectly dependent on the sun for energy?

As the polypeptide is elongating during translation, what is the ribosome doing?

A gazelle population nearly doubles in four months (March - June). Which statement below best explains this change in gazelle population? : The numbers of predators have increased. Food resources have diminished.

Canned food is prone to what if cooked at a low heat? 1. Food containing more nutrients 2. Better tasting food 3. Botulism 4. can be canned in thinner cans

How can changing ocean currents lead to climatic cooling?

What color of light is the best for photosynthesis