According to Passage A.one reason natural selection leads to species change is that favorable traits: are quickly spread across all animals in an ecosystem. always result in the creation of entirely new species. can be passed down to future generations. are determined by conscious decisions made by organisms.

Muscles composed mostly of series arranged sarcomeres will: Have a greater cross sectional area Have reduced fiber packing Have shorter fascicles Conduct greater force

The common vector for Lyme disease is the: sand fly mosquito tick mite

Primary uses of nutrient molecules 1) __ (catabolism to produce ATP) 2) __ (subunits for anabolism) 3) storage for future use

Brain chemical associated with the stress response Neurotransmitters Dopamine Norepinephrine Serotonin

What division of the nervous system stimulates the organs and glands? Central Autonomic Somatic Afferent

A collection of cells that grow abnormally and are capable of spreading to other parts of the body Carcinogen Malignant tumor Carcinoma Stem cell Cancer promoter

Which of the following is the chemical messenger that binds to receptors on the muscle fiber and stimulates the muscle fiber to contract? A lactic acid B acetylcholine C calcium ions

Discharge of semen into the prostatic urethra is called Select one: A. emission. B. ejaculation. C. ovulation. D. ejection. E. erection.

FSH is also referred to as a gonadotropin. True False

Which cell organelle stores up calcium ions for the muscle fiber? Mitochondria Sarcoplasmic Reticulum Sarcolemma