The neurotransmitter acetylcholine A)holds oxygen
B)is made up of fascia
C)is made up of myosin & actin
D)stimulates a muscle fiber & causes it to contract

Variety of living organisms; includes genetic, species, and ecological types.

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred

In cellular biology, what is the definition of the word specialized? te o a. carried across the cell membrane by a specific protein a o b. a structure within a eukaryotic cell that performs a specific function o c. adapted to a specific function or condition es essere beste ser bendere s b tele ee o d. containing unique dna ser eeseen les, e nde este ses see ste submit e