In perfect competition: a. price and average variable cost are the same. b. price and marginal revenue are the same. c. total revenue and total variable cost are the same. d. price and total revenue are the same.

b. price and marginal revenue are the same.

Explanation:

A perfect competition is a market where there are many buyers and sellers of homogenous goods and services.

There are no barriers to entry and exit of firms into the market. As a result of this, firms earn zero economic profit in the long run.

Firms are price takers. Market prices are set by market forces.

Price is equal to marginal revenue and average revenue.

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searching efficiency (a)

Explanation:

The other word for Lotka-Volterra is predator-prey in which they have a combination of the differential equation which consists of nonlinear and should be the first ordered sequence.

It is used to tell the biological system changes where the two species interacted with each other. The one is the predator and the other one is prey.

Now according to the question the rate at which the  predator-prey change is searching efficiency (a) as it shows the changes of predator species with the respect that how quick they determine, attack it and consumed it