What is a stimulus in biology?

As far as Alzheimer's researchers know, the primary cause of Alzheimer's disease is: a. deterioration of neurons that produce the neurotransmitter acetylcholine. b. pruning or deterioration of unused neurons over the life span. c.

The process by which a cell captures the energy in sunlight and uses it to make food called what

What are the 4 basic steps for DNA extraction?

Is a streptococcus bacteria a prokaryotic or a eukaryotic

Meiosis occurs in the A. mitochondria B. chloroplast C. sex cells D. somatic cells

A gradual change in phenotype over a geographical area is called a?

Which of the following changes in deciduous forests occurs in the winter? a. Trees regain their leaves. b. Trees block the flow of water and nutrients to their leaves. c. The leaves of trees begin to lose their chlorophyll. d.

Which statement about somatic mutations is true

uring which period of prenatal development would exposure to teratogens most likely cause defects to major body structures? a. embryo b. implantation c. fetus d. zygote

The table compares the features of two plant species that exist near the shoreline in South Florida. Tree Species Data Tree Species Shade Provided Native Low Exotic High The nesting sites of sea turtles are more successful when the sites have more