What chemical ion is responsible for initiating the contraction of a muscle fiber?

Why did dna technology lead to more use of cladistics? a. it showed that the linnaean system was the most accurate. b. it changed ideas about which animals were closely related. c. it proved that eukaryotes formed from endosymbiosis. d.

When you are finished running the bases you are sweating and you feel thirsty what body systems are interacting in this case

The fiber-rich portion of the grain is the bran True False

What happens when blood volume is lost from the body?

Which is not something the respiratory system does?

A gene pool consists of all the genes within a

A scientist want to observe The structure that joins a cell to neighboring cells. How should the scientists observe

The cell cycle consists of A. Mitosis and interphase B. Meiosis and interphase C. Prophase and interphase D. Metaphase and interphase E. changes from a haploid to a diploid state

Why is the theory of abiogenesis just another example of the idea of spontaneous generation?

What is the role of the plasma cell in the antigen-antibody response? makes an antigen harmless without destroying it produces antibodies against the sensitizing antigen produces antibodies after an exposure to a known antigen clumps