Which organism appeared on Earth first?

gastropods

or

horn corals

What should a beginner do during the initial phase of an exercise program?

Propose suggestions of things that could affect specific heart structures that in turn cause a malfunction in the flow of blood through the heart or the body?

What materials are bones first made out of?

How will the filtration rate in the renal corpuscles be affected if a kidney stone creates a blockage of the urinary tract?

Are every one of the chromosomes different between men and women

Explain what prevents a postsynaptic cell from being continuously stimulated

What a three main types of sedimentary rocks

What are the two major organs that occupy the thoracic cavity?

A 1 ml sample of culture liquid contained 1000 viable bacterial cells. You serially diluted it twice, performing 10-fold or 1/10 dilutions into a final volume of 1 ml each time.

Which hormone is necessary for the growth of endometrial glands which are important for the sustenance of a growing embryo until its implantation?