1. Five human activities are listed below. 1. Raising cattle
2. Driving a gasoline powered car
3. Using a natural gas fireplace
4. Walking
5. Swimming in a lake
Which of the above activities could contribute to the greenhouse effect?
A) 1 and 2 only
B) 1, 2 and 3
C) 2 and 3 only
D) 4 and 5 only

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

In which squares should the phrase "green pods" appear a) a and d b) b and e c)a, c, and d d)a, b,c, d and e

Which type of neuron stimulates muscles to contract?