I think 2 but I’m not very sure
The Earth<span> is unlike every </span>other planet<span> in the Solar System in a number of </span>different<span> ways. It is the only </span>planet<span> that has an atmosphere containing 21 percent oxygen. It is the only </span>planet <span>hat has liquid water on its surface. It is the only </span>planet<span> in the solar system that has life.</span>
Answer:
Prostate gland
Explanation:
Prostate gland is an exocrine gland of the male reproductive tract that secretes alkaline fluid which is about 30% of seminal fluid. The role of the prostate and its secretion is to nourishes and protects sperm.
This gland vary in size and vary in secretions among different species.
The activity of the prostate is under the control of hormones, mostly testosterone (its metabolite dihydrotestosterone), produced by the testicles.
Answer:
Population
Explanation:
All the members of one species in a particular area are referred to as a population.
Sea urchin embryo requires temperature of 23 degrees to cleave, in lower temperatures the embryo cleavage slows down.
Explanation:
Although the sea urchins live in sea water in cold temperature, they require a temperature of around 23 degrees to cleave for fertilisation if this temperature is reduced the process of cleavage slows down eventually depleting the urchin population.