The number of trophic levels in an ecological energy pyramid

a. is limited by the amount of energy lost at each trophic level

b. is impossible to figure out

c. is limitless

d. never exceeds three

Which part of a phospholipid faces toward the aqueous environment

What do you know about an organism's parents if it is heterozygous for a certain trait? A. Both parents supplied the same allele. B. The parents supplied different alleles. C. The parents had different traits. D. The parents had the same traits.

A parabola has a vertex at the origin at (0,0). The equation of the directrix of the parabola is x=-4 In which direction does the parabola open? A) Up B) Down C) Right D) Left

Acar moves from A to B it's fed with fuel, which it burns to produce energy and it gives out waste products in the form of exhaust fumes. Do these characteristics prove that a car is a living thing? explain your answer.

Compare and contrast molds, casts, and trace fossils.

What was the relationship of the deer herd population size and the carrying capacity of the range in 1915 1920 1924?

What's happening in the evening of a hot summer day the air is cool but the sidewalk feels warm

Need the answer quickly A scientist observed that fiddler crabs are capable of plugging up the territorial burrows that they live in.

Calcium and bromine would join with a __bond and sulfur oxygen would join with a ___bond

What does lipase digest? A. Carbohydrates B. Proteins C. Fats