Describe the contribution of biologists to the cell theory.

If this flower has a normal chromosome number of thirty-eight, what is the number of chromosomes present in a sperm cell of this species? A 2 B 19 C 38 D 76

Carbon dioxide is returned to the atmosphere through: transpiration photosynthesis respiration weathering

Which sequence best describes the passage of sperm? 1. Seminiferous tubules. 2. Vas deference. 3. Epididymis 4. Ejaculatory duct 5. Urethra. A. 3,1,2,4,5 B. 1,3,2,4,5 C. 5,4.2,3,1 D. 1,3,4,2,5 E. 3,1,4,2,5

What must an organism do to be considered successful according to natural selection?

Recall that in mendel's garden peas, the yellow gene determines flower color, with the a (yellow) allele dominant to the a (green) allele. in a population of 200 plants, the genotype frequencies are 50% aa, 25% aa, and 25% aa.

What is causing the overgrowth of plankton and algae that chokes out other life forms?

Some students are comparing the parts of a cell to the parts of the body. Which part best represents the cell membrane and why?

What is secondary succession?

Scientest distinguish whether an entity is living or non living by describing of life

Write your own 1-2 sentences that explains how the following words are related: Traits, Genes. Alleles. Here