Which step precedes all of the other listed steps?

A) Na + rushes into the cell

B) ACh is released by the motor neuron

C) An action potential starts on the sarcolemma

D) The sarcoplasmic reticulum is activated

Which pair of organisms is most closely related to primates? amphibians and rodents, crocodiles and amphibians, rodents and rabbits, dinosaurs and birds

Transmission electron microscopes are best for viewing A. microorganisms in pond water B. internal organs of a mouse C. internal structures of a cell D. surface features of a specimen

Similar to nitrogen, phosphorus is often a limiting resource in soils, which constrains plant growth. Consequently, fertilizers usually contain large amounts of phosphorus.

When does the anterior fontanel of an infant close

One way to reduce bias in an experiment is to

In humans a gene that has been identifoef as causing a type of skin cancer is the

Which one of the "big 3" macronutrients is the most calorically dense at 9 calories per gram?

What happened at Chernobyl? (first to answer this will be marked as the brainliest)

2 cycles most closely related in their role in sustaining life

Which statement explains the difference between multiple alleles and polygenic inheritance? A. Multiple allele means more than one gene contributes to the phenotype and polygenic inheritance means more than two forms of the same gene in the