Which of the following is an extrusive igneous rock that contains so many air pockets that it often floats in water

a.) obsidian

b.) granite

c.) gabbro

d.) pumice

Phenylketonuria (PKU) is a disease that results from a recessive gene. Two normal parents produce a child with PKU. What is the probability that a sperm from the father will contain the PKU allele

In a dihybrid cross, in which both parents are heterozygous for both traits, what is the probability that the offspring will exhibit both of the dominant phenotypes?

Which of the following would describe Lamarques ideas about evolution

Because of what scientists have learned about monoculture, they are: A not pushing for a change in farming. B asking for legislation mandating GMOs. C suggesting ways to protect food supplies. D telling farmers they need to grow fewer kinds of crops.

What occurs if a t cell binds to an antigen and the t cell does not receive a co-stimulatory signal?

In a, are (Y) and are (y). A=4 B=1 C=2 D=3

wall of the gut tube has layer of smooth muscle that run both circulary and longitudinally contraction of these muscles produces

Many toxins and poisons block certain enzymes in the mitochondria. For example, many fruits, including apricots, apples, plums, peaches, and cherries, contain seeds and pits that can cause the formation and release of the poison cyanide if they are

In a classroom system, the students produce an output of information on tests and homework. This information becomes an input for the grading part of the system. Which statement about the output of the students is true? A.

In two or more complete sentences describe how a dam placed in a river can act as both a constructive and destructive force.