Darwin hypothesized that there are definite steps to natural selection. Consider the model for natural selection. Describe a scenario that represents this model of natural selection according to Darwin.

What characteristics of the circulatory system increase its efficiency?

One flower is heterozygous red (Rr) and it is crossed with a homozygous white (rr) plant. Use a Punnett square to determine the probability of one of their offspring having a red color.

Which of the following is not a reason green algae are classified as plants? They have cellulose in their cell walls. They have chlorophyll a and b. They have genes similar to genes in land plants. They are single-celled organisms.

Which macromolecule gives the body the energy it needs to carry out cell functions

Oxytocin communicates the need for contractions during childbirth. Oxytocin is an example of what type of protein? enzyme motor protein sensory proteins signaling protein

How is aneuploidy different from polyploidy? How is aneuploidy different from polyploidy? Aneuploidy occurs when one or more chromosomes are lost or gained relative to the normal euploid number.

a student conducts an experiment to determine if ultraviolet light kills bacteria. his result do not support his hypothesis. we say that the hypothesis is

What do all fossil fuels have in common?

What is the name of the process cells membrane pinching in the center to form two daughters cells

Which of the following is an example of an organism maintaining homeostasis? 1. A cat grooming itself 2. A bear nursing her cubs 3. A man sweating while he runs 4. A boy riding a bike