How do genes have an additive effect in polygenic inheritance? Select all that apply

Genes diversify to create several discrete phenotypes

A single gene with many alleles determines the phenotype

The number of possible phenotypes can add up until there is a continuous range of phenotypes

Each gene contributes a small part to the phenotype

Which of the following is not a way in which a vascular plant's xylem and phloem are similar?

What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos