At what age is the difference between the average height of boys and girls greatest? Estimate this difference to the nearest centimeter.

In an area of erratic rainfall, a biologist found that grass plants with alleles for curled leaves reproduced better in dry years, and grass plants with alleles for flat leaves reproduced better in wet years.

A grassland environment, called a savanna, would be able to support the energy needs of carnivores because A grasslands have grasses and plants to eat for animals that are not carnivores, which then provides animals for the carnivores to eat.

One major difference between acquired traits and entirely genetic traits is that acquired traits___. A) must be a result of a mutation B) cannot be passed on to offspring C) are only behavioral, never physical D) do not affect an organism's

What type of bonds link nucleotides together? ...

Bacteria cause diseases by A. producing toxins. B. reducing wrinkles. C. destroying tissues. D. both (A) and (C).

Invertebrates are the most commonly found fossils because they:

Recent studies have found traces of the insecticide DDT accumulated in the fat tissue of many wild animals. A correct explanation for this accumulation is that

Cell engulfs microorganisms in cell "eating": pinocytosis active transport phagocytosis passive diffusion facilitated diffusion

Which kind of organism is an autotroph? consumer producer decomposer herbivore

Which process connects glycolysis and the citric acid cycle?